For the pure DW test: Your expected proc rate on the IK is 12% * (1.7 actual delay / 3.0) = 6.8%. In the DW-only test, we saw a 6.82% proc rate. Looks good. Ice blast's listed proc rate is 10%. Normalized to 1.7 delay, that would be 5.67%. We only saw a 2.18% proc rate. If we took a guess that the proc rate on your shirt is halved on a DW weapon, then it was expected to proc 2.83%, which is pretty close to 2.18%. A larger sample would help. For the pure 2H test: Your expected proc rate on the RGF is 12% * (3.8 actual delay / 3.0) = 15.20%. In the 2H-only test, we saw a 13.95% proc rate. Close; were you wearing a haste sash or bangle?. Ice blast's listed proc rate is 10%. Normalized to 3.8 delay, that would be 12.67%. The actual proc rate was 13.37%. Both numbers are close enough that we can chalk up differences to the RNG.