The spring height was insufficiently set, resulting in less spring pressure than was required to control the hydraulic roller lifters. By the time I noticed it, the issue resulted in all the needle bearings in my exhaust-side T&D Rockers disintegrated. My intake pushrods were close enough to the outside of the intake ports to touch them when they began to flex from the harmonics caused by valve float.This was not the case with the exhaust pushrods. They were isolated from contact with anything other than the two ends. This allowed them to effectively turn into a roller bearing destroying harmonic resonance.

Dwayne Porter figured out what went wrong, and helped me switch over to solid rollers. I never looked back.