I don't trust that series of simulation programs to give realistic results any longer... FWIW

Rocker ratio should be selected in conjunction with cam profiles, LSA, etc. That said, my personal experience has been anywhere from no improvements found to maybe 5-8 HP on "best case" scenario.

The other thing is you can't ASSume the published ratios reflect the actual delivered (real valve springs, not checking) ratio. It can also vary a good bit from above to below stated ratio depending upon brand / design. It's one of those areas that the only way to know is to mock up everything with the actual parts and check the net lift.