diff --git a/ars.lua b/ars.lua
index 52e5bd1..9398afb 100644
--- a/ars.lua
+++ b/ars.lua
@@ -55,6 +55,7 @@ local function collect_best_indices(scored, top, antithetic)
 end
 
 local function kinda_lipschitz(dir, pos, neg, mid)
+    --[[
     -- based on the local lipschitz constant of a quadratic curve
     -- drawn through the 3 sampled points: positive, negative, and unperturbed.
     -- it kinda helps? there's probably a better function to base it around.
@@ -64,6 +65,10 @@ local function kinda_lipschitz(dir, pos, neg, mid)
     local l0 = abs(3 * c1 + c0)
     local l1 = abs(c1 + 3 * c0)
     return max(l0, l1) / (2 * dev)
+    --]]
+    -- based on a piece-wise linear function of the 3 sampled points.
+    local _, dev = calc_mean_dev(dir)
+    return max(abs(pos - mid), abs(neg - mid)) / dev
 end
 
 function Ars:init(dims, popsize, poptop, base_rate, sigma, antithetic,
diff --git a/config.lua b/config.lua
index 63746f6..ee338f3 100644
--- a/config.lua
+++ b/config.lua
@@ -34,6 +34,7 @@ local defaults = {
 
     -- network evaluation (sampling joypad):
     frameskip = 4,
+    prob_frameskip = 0.0,
     -- true greedy epsilon has both deterministic and det_epsilon set.
     deterministic = false, -- use argmax on outputs instead of random sampling.
     det_epsilon = false, -- take random actions with probability eps.
diff --git a/main.lua b/main.lua
index 5b9078d..61df8eb 100644
--- a/main.lua
+++ b/main.lua
@@ -24,6 +24,7 @@ local trial_frames = 0
 local total_frames = 0
 local lagless_count = 0
 local decisions_made = 0
+local last_decision_frame = -1
 
 local force_start = false
 local force_start_old = false
@@ -676,6 +677,7 @@ while true do
     if reset then
         do_reset()
         lagless_count = 0
+        last_decision_frame = -1
     end
 
     if not cfg.enable_network then
@@ -692,8 +694,11 @@ while true do
         game.W(0x75A, 1)
     end
 
-    local doot = jp == nil or lagless_count % cfg.frameskip == 0
+    local delta = lagless_count - last_decision_frame
+    local doot = jp == nil or delta >= cfg.frameskip
+    doot = doot and random() >= cfg.prob_frameskip
     doit(not doot)
+    if doot then last_decision_frame = lagless_count end
 
     -- jp might still be nil if we're not ingame or we're not playing.
     if jp ~= nil then joypad.write(1, jp) end
diff --git a/presets.lua b/presets.lua
index 37d9965..bb87166 100644
--- a/presets.lua
+++ b/presets.lua
@@ -142,6 +142,68 @@ make_preset{
     momentum = 0.5,
 }
 
+make_preset{
+    name = 'ars-vanilla',
+    parent = 'ars',
+}
+
+make_preset{
+    name = 'ars-skip',
+    parent = 'ars',
+
+    frameskip = 1,
+    prob_frameskip = 0.25,
+}
+
+make_preset{
+    name = 'ars-lips',
+    parent = 'ars',
+
+    ars_lips = true,
+    momentum = 0.5,
+    param_rate = 1.0,
+}
+
+make_preset{
+    name = 'ars-big',
+    parent = 'ars',
+
+    epoch_top_trials = 75,
+    epoch_trials = 100,
+    momentum = 0.5,
+    param_rate = 1.0,
+
+    --graycode = true,
+}
+
+make_preset{
+    name = 'ars-huge',
+    parent = 'big-scroll-hidden',
+
+    deterministic = true,
+    deviation = 0.01,
+    epoch_top_trials = 75,
+    epoch_trials = 100,
+    es = 'ars',
+    momentum = 0.5,
+    param_decay = 0.0138,
+    param_rate = 0.5,
+}
+
+make_preset{
+    name = 'ars-stupid',
+    parent = 'big-scroll-reduced',
+
+    es = 'ars',
+    epoch_top_trials = 4,
+    deterministic = false,
+    deviation = 0.2,
+    epoch_trials = 4,
+    param_rate = 0.1,
+    param_decay = 0.003,
+    momentum = 0.99,
+}
+
 make_preset{
     name = 'play',