'pro comp' roller rockers
Be sure to check and correct the geometry even with Hughes rockers.
Dave will tell you that you don't need to, but Dave can be full of ****. Any time you change ONE thing in an equation, it changes everything. Just the fact that it has a roller tip makes geometry correction necessary.
Keep reading the tech on the B3 site.
I've seen more failed rockers from bad geometry than anything else. And the witness mark was always centered.