diff --git a/README.md b/README.md
index 6743f91..b59c6bc 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 Current [semantic](http://semver.org/) version:
 
 ```clojure
-[com.taoensso/touchstone "0.13.1"]
+[com.taoensso/touchstone "0.14.0"]
 ```
 
 # Touchstone, a Clojure split-testing library
@@ -26,7 +26,7 @@ Touchstone is an attempt to bring **dead-simple, high-power split-testing** to a
 Depend on Touchstone in your `project.clj`:
 
 ```clojure
-[com.taoensso/touchstone "0.13.1"]
+[com.taoensso/touchstone "0.14.0"]
 ```
 
 and `require` the library:
@@ -49,7 +49,7 @@ Traditional split-testing consists of 4 steps:
 
 The particular multi-armed bandit technique used by Touchstone means that we only concern ourselves with steps 1 and 3. Steps 2 and 4 are handled automatically by the algorithm.
 
-**To optimize a Ring web application**, start by adding `(taoensso.touchstone.ring/make-wrap-random-test-subject-id)` to your middleware stack.
+**To optimize a Ring web application**, start by adding `(taoensso.touchstone.ring/wrap-random-test-subject-id)` to your middleware stack.
 
 One or more named-test selectors can then be used as part of your page content:
 
diff --git a/project.clj b/project.clj
index 7df52d0..40b9dea 100644
--- a/project.clj
+++ b/project.clj
@@ -1,10 +1,10 @@
-(defproject com.taoensso/touchstone "0.13.1"
+(defproject com.taoensso/touchstone "0.14.0"
   :description "Clojure split-testing library"
   :url "https://github.com/ptaoussanis/touchstone"
   :license {:name "Eclipse Public License"}
   :dependencies [[org.clojure/clojure            "1.3.0"]
                  [org.clojure/tools.macro        "0.1.1"]
-                 [com.taoensso/carmine           "1.1.0"]
+                 [com.taoensso/carmine           "1.6.0"]
                  [org.clojure/math.combinatorics "0.0.3"]]
   :profiles {:1.3   {:dependencies [[org.clojure/clojure "1.3.0"]]}
              :1.4   {:dependencies [[org.clojure/clojure "1.4.0"]]}
diff --git a/src/taoensso/touchstone.clj b/src/taoensso/touchstone.clj
index 74680a9..3f5d8cb 100644
--- a/src/taoensso/touchstone.clj
+++ b/src/taoensso/touchstone.clj
@@ -26,17 +26,16 @@
 ;;;; Config & bindings
 
 (utils/defonce* config
-  "This map atom controls everything about the way Touchstone operates.
-  See source code for details.
-
-  WARNING: per-test config API very likely to change before 1.x release."
+  "Alpha - subject to change.
+  This map atom controls everything about the way Touchstone operates.
+  See source code for details."
   (atom {:carmine {:pool (car/make-conn-pool)
                    :spec (car/make-conn-spec)}
          :tests {:default {:test-session-ttl 7200 ; Last activity +2hrs
                            ;; Turn on for engagement testing:
                            :count-duplicate-activity? false}}}))
 
-(defn set-config! [[k & ks] val] (swap! config assoc-in (cons k ks) val))
+(defn set-config! [ks val] (swap! config assoc-in ks val))
 
 (defn test-config "Returns per-test config, merged over defaults."
   [test-name]
diff --git a/src/taoensso/touchstone/ring.clj b/src/taoensso/touchstone/ring.clj
index b3dcb65..a36cb9a 100644
--- a/src/taoensso/touchstone/ring.clj
+++ b/src/taoensso/touchstone/ring.clj
@@ -14,21 +14,25 @@
 
 (comment (bot-user-agent? {"user-agent" "GoogleBot"}))
 
-(defn make-wrap-random-test-subject-id
-  "Returns Ring middleware that generates, sessionizes, and binds a test-subject
-  id for requests eligible for split-testing (by default this excludes clients
-  that report themselves as bots)."
-  [& {:keys [eligible?-fn]
+(defn wrap-random-test-subject-id
+  "Ring middleware that generates, sessionizes, and binds a test-subject id for
+  requests eligible for split-testing (by default this excludes clients that
+  report themselves as bots)."
+  [handler
+   & {:keys [eligible?-fn]
       :or   {eligible?-fn (fn [request] (not (bot-user-agent? (:headers request))))}}]
-  (fn [handler]
-    (fn [request]
-      (if-not (eligible?-fn request)
-        (handler request)
+  (fn [request]
+    (if-not (eligible?-fn request)
+      (handler request)
+
+      (if (contains? (:session request) :mab-subject-id)
+        (let [sessionized-id (get-in request [:session :mab-subject-id])]
+          (touchstone/with-test-subject sessionized-id (handler request)))
 
-        (if (contains? (:session request) :mab-subject-id)
-          (let [sessionized-id (get-in request [:session :mab-subject-id])]
-            (touchstone/with-test-subject sessionized-id (handler request)))
+        (let [new-id   (str (rand-int 2147483647))
+              response (touchstone/with-test-subject new-id (handler request))]
+          (assoc-in response [:session :mab-subject-id] new-id))))))
 
-          (let [new-id   (str (rand-int 2147483647))
-                response (touchstone/with-test-subject new-id (handler request))]
-            (assoc-in response [:session :mab-subject-id] new-id)))))))
\ No newline at end of file
+(defn make-wrap-random-test-subject-id
+  "DEPRECATED. Please use `wrap-random-test-subject-id."
+  [& args] (fn [handler] (apply wrap-random-test-subject-id handler args)))
\ No newline at end of file
diff --git a/src/taoensso/touchstone/utils.clj b/src/taoensso/touchstone/utils.clj
index d963a13..5c6274e 100644
--- a/src/taoensso/touchstone/utils.clj
+++ b/src/taoensso/touchstone/utils.clj
@@ -52,7 +52,5 @@
          (time (dotimes [_ 10000] (name :foo)))
          (time (dotimes [_ 10000] (scoped-name :foo))))
 
-(defn approx=
-  [x y & {:keys [significance]
-          :or   {significance 0.001}}]
-  (< (- x y) significance))
\ No newline at end of file
+(defn approx= [x y & [signf]]
+  (< (Math/abs (double (- x y))) (or signf 0.001)))
\ No newline at end of file