Sometimes performance can be off for something that is taken for granted, like valve springs. If they aren't doing the best job, the car will be off quite a bit. Sometimes the needed springs are much bigger than recommended by the cam grinder, or just plain better springs. I found that to be true with a good sized roller years ago. It turned out the springs were the problem to the tune of .11 in the 1/8th mile. Those springs were up to spec, but a bad design that others had had problems with as well. Resonance frequency and spring weight is something often overlooked.
As far as critiquing the cam, that's part of the deal when you ask why a combo isn't working.
What density altitude was your best run at?