don't guess at this stuff... you have to know what your head flows on a flow bench. if your cam is not lifting the valve high enough to get the max flow from your testing on a bench then higher ratio rockers is one way to achieve that. the other way is to change the cam to a higher lift. keeping in mind what the degrees the cam opens and closes will let you know what kind of rpm range your able to run, which coinsides with having enough air flow to do that. having more lift is not always better, you can lift it to the moon if you want but if the head does not flow at those higher lifts you will make less power not more.