diff --git a/cuburn/code/iter.py b/cuburn/code/iter.py
index 7b71237..bccd401 100644
--- a/cuburn/code/iter.py
+++ b/cuburn/code/iter.py
@@ -346,18 +346,18 @@ iter(uint64_t out_ptr, uint64_t atom_ptr,
     cvt.u64.u32         ptr,    off;
     add.u64             ptr,    ptr,    %4;
 
-    // 80% of the time, do an atomic add, then jump to the end without
+    // 97% of the time, do an atomic add, then jump to the end without
     // stalling the thread waiting for the data value
-    setp.le.f32         p,      %5,     0.80;
+    setp.le.f32         p,      %5,     0.97;
 @p  red.global.add.u64  [ptr],  val;
 @p  bra                 oflow_end;
 
-    // 20% of the time, do the atomic add, and wait for the results
+    // 3% of the time, do the atomic add, and wait for the results
     atom.global.add.u64 val,    [ptr],  val;
     mov.b64             {lo, hi},       val;
 
-    // If the density is less than 32, jump to the end
-    setp.lo.u32         p,      hi,     (256 << 22);
+    // If the density is less than 64, jump to the end
+    setp.lo.u32         p,      hi,     (256 << 23);
 @p  bra                 oflow_end;
 
     // Atomically swap the integer cell with 0 and read its current value