Yes, I am happy to have over interpreted, though I did just shoot a ballet performance with my 150,2 and not a single image was in focus except for the handful I took after switching to MF. Mixing up the MMF-3s would have been a good explanation and a relief. I hate focus tuning.
Focusing tuning can be a pain in the ass. Have you done the adjustment at all on the 150/2?
Next month I will be doing all my 4/3 lenses (4) and the 300/4 on two cameras in all combos with the TC’s. I will dedicate a day to doing them all, hopefully it doesn’t bleed over into a 2nd day (but I want to test a few things so it could take a bit longer). My plan is to assign each MMF-3 to a camera and only use that MMF-3 with that camera. While theoretically there should be no difference (I do plan to test one lens with both on the same camera to confirm), it will just put my mind at ease if I only use the MMF-3’s on the body tested on.