[serialk11r]

I don't know if 60% is the right conclusion to be drawing, since no load operation is affected by incomplete combustion. It's certainly a horrific number.

How's your IAT? Have you experienced any knock? You could try a more aggressive warm air intake (maybe with a manually controlled air door in case it gets too hot). The engine speed is in a pretty good spot IMO, but you're pulling too much vacuum. If you can successfully get the IAT higher than the engine can tolerate, you should be able to change the cam timing to reduce internal EGR but delay valve closure which will reduce your pumping losses further.