One last thought, have you measured the clearance you have with the cast rocker body to your shaft?

Yes you do have alot of heat and what looks like an abnormal wear pattern, refer to Roberts pic of the wear on that shaft, its where it should be vs what might be the full diameter on yours.

My comps are not on the as delivered shafts, they did get hot so I went to a shaft with a hair more room and probably a harder shaft as well and the problem was fixed.

Can you measure and post the dia. of your current shafts? And maybe the inside diameter of your cast rockers?