Yes, any change to the valve train geometry will result in some associated change to the effective valve lift curve. Nothing new here, but it takes some seriously anal types like myself who will admit to having actually measured the entire lift curve as the result of making some changes to the geometry.

I've done the same thing to see what the net change to the lift curve is from different rocker arm brands & ratios, as well as lash changes for solid cams.

You still haven't provided the track test conditions (temp, humidity, barometric pressure, etc.) for the before & after comparisons, along w/ the actual incremental differences in ET & MPH.