The roller tip wear could be related. Without nanner grooves, there's a lack of oil. I would be inspecting everything about those rockers and shafts. Look very closely at all of the oil passages. If you weren't having pushrod or adjuster wear, I tend to agree you don't have an oiling problem from the engine. I would also make dang sure you have enough oil coming from the engine to the shafts. I bet you do.