Going back to basics, do a leakdown test and see how bad it is.
If the rings are worn, they won't get better.
If an engine enters detonation, pressure escapes BETWEEN the piston ring and the ring land and eventually, if unchecked, detonation will break the ring land.
Are "the other guys" having issues as well? A Paxton for example, starts to pump air at higher r.p.m. when a heavy truck like ours is already moving, not unlike a turbo, and have less of an issue with detonation with a basic tune. A twin screw has the ability to make power RIGHT OFF IDLE when basically little or no weight is moving yet. This is a recipe for the possibility of detonation due to extreme cylinder pressures like a diesel encounters (HEAVY load with HIGH cylinder pressure). Adding to this, our engines have a high bleed down lifter that produce EVEN MORE cylinder pressure (which is torque) at a low r.p.m. This really puts heavy emphasis on tuning.
Venting is a band-aid solution to a problem which is: The rings/ring lands are no longer able to seal cylinder pressure and this pressure is escaping into the crankcase instead of sealing and producing power.
Understanding it IS a sticky (political) issue, it is a mechanical device that has been modified with forced induction and something has caused your engine to lose it's seal.
Anyhow, it looks like a rebuild is required.
