I'm not sure which notion I would abandon first............the " shelf cam " , or " Hydraulic roller ".
Probably in that order.
It is so easy to have a cam spec'ed for your combination these days and several cam companies are very good at it.
I really like Bullet...........they have done a solid roller and hyd. flat tappet for me and I am happy with both.
Two totally different motors , but they listened to my ideas and added theirs.
They aren't just selling parts , and they have the experience to recommend what will work.
I have no experience with Hyd. rollers , but for serious performance it would not be my first choice.