cam question

According to edelbrock the victors flow roughly 20-30 cfm more from 400 to 600 lift than the performers and close to the trick flow. Why is Andys 470 with 271 @ 50 giving up the ghost early with trick flows?I think i am seeing pattern but cant understand.A 426mw
stocker w/stock(nhra legal cheated up) holds rpm longer as Andy said.

Many cyl head porters dont care about low lift flow in fact they try to lower it
Please lets continue this discussion for the sake of knowledge.
Thanks Joe