The tight lash solid rollers I've run were set at .010 cold, I wouldn't run more than .016 cold on a standard cam, but that's just me. From what I've seen the tight lash is a faster ramp that will wear things out faster. You can make good power with a slower ramp solid roller cam and it will live longer. I would check the lifters at 100 hours, pull them out and spin the rollers, the Crower 66291H are rebuild-able. In my opinion the stainless shaft rockers are more stable than your stud girdle, you're not putting all of the pressure at the top of the rocker stud. The stands bolt directly to the head. All rockers have a life cycle, I believe stainless is about 10 x longer than aluminum maybe more. Break a rocker at any RPM and you beat the piss out of the cam lobe, lifter and push rod, one of them will be the next thing to go. My opinion, the valve train is not the place to budget, do it right the first time and you'll save a ton of money in the long run.

HP is limited by the air and fuel that can't get through the motor, the better flowing heads (without being excessively large) with the right cam, intake and exhaust will make the best power. Maybe have someone flow your 325's and see how they compare to the 335. Are you staying with the 509 ?