Pushrods

You really need to find out why you are bending the push rods. I have a 225 engine with large valves, head milled .125, a .525 lift cam, single spring with damper, stock push rods, and rocker arm/shaft. Haven't had any problems. Did have to set the spring height, and check for coil bind (close, but just barely OK), did have to shorten the valve guides.

^^^ I was going to suggest looking at max lift and see what clearance you have on the guides too or check for coil bind. Shimming the rocker shaft sounds like a good way to fix the geometry issue.