Motor mounts are only a few months old, actually. Did those together with the subframe mounts, that was fun.
Didn't seem plausible that oil pressure would drop under acceleration, I agree. I don't know where the oil tube connection to the motor is, but I'll look at the back of both heads. I have seen the temp gauge sensor on the passenger side head, is the oil tube usually on the other side?
I thought that perhaps the pressure drop might actually be vacuum-related. Could crankcase ventilation drop so much that the crankcase pressure rises and somehow affects oil flow in the engine?