A longer valve would only make this situation worse, as would lash caps. The OP said the rocker had a lot of angle which would be made worse with this approach, not to mention have terrible geometry. The rockers are manufactured with plenty of clearance for the spring if the rocker is properly located. It needs to be moved to the right place!

Mike Beachel

I didn't write the rules of math nor create the laws of physics, I am just bound by them.