All I know is what I did and have done in the past and it works great, perhaps the actual valve lift don't match theoretical, wouldn't be the first time, my good dial indicator sprouted legs and runnoft and now the engine is all together and running. The first one I did is in a 3/4 ton work truck that now has 30,000 hard miles on it and still running great. I know my methods might not always be the most scientific butt the results are that it works. Do you have an assembled engine with that cam you can see how much lift is lost in real world?