diff --git a/src/propeller/problems/simple_regression.cljc b/src/propeller/problems/simple_regression.cljc
index f619660..3f84e9f 100755
--- a/src/propeller/problems/simple_regression.cljc
+++ b/src/propeller/problems/simple_regression.cljc
@@ -75,7 +75,7 @@
        :parent-selection         :lexicase
        :tournament-size          5
        :umad-rate                0.1
-       :variation                {:umad 0.5 :crossover 0.5}
+       :variation                {:umad 1.0 :crossover 0.0}
        :elitism                  false}
       (apply hash-map (map #(if (string? %) (read-string %) %) args))))
   (#?(:clj shutdown-agents)))
diff --git a/src/propeller/problems/string_classification.cljc b/src/propeller/problems/string_classification.cljc
index 6692233..80c95e0 100755
--- a/src/propeller/problems/string_classification.cljc
+++ b/src/propeller/problems/string_classification.cljc
@@ -97,7 +97,7 @@
        :parent-selection        :lexicase
        :tournament-size         5
        :umad-rate               0.1
-       :variation               {:umad 0.5 :crossover 0.5}
+       :variation               {:umad 1.0 :crossover 0.0}
        :elitism                 false}
       (apply hash-map (map #(if (string? %) (read-string %) %) args))))
   (#?(:clj shutdown-agents)))