there are parts of some frames where I hit focus - but not where I wanted! I did get a few perfect shots through.
Next question is it possible that DoF carried the perfect shots?
Put the camera on a tripod, level on all axis, then focus on a target 6 to 10 feet away (measure from the film plane). Does the focused distance scale match the actual distance to the target?
Yes-camera is likely good.
No- make a temporary ground glass by cutting a piece of regular glass (clear acrylic works also) to fit onto the film guides (not the paper guides) at the image opening. Place strips of Scotch Magic Transparent tape next to each other without overlapping.
Open the shutter on T or B with a locking cable release and the aperture wide open, place the temporary gg on the film plane tape side toward the lens, check taking lens focus with a loupe against the view lens on the focus screen with the loupe or magnifier.
If the view and taking lens disagree adjust the view screen or view lens to match the taking lens. You will need to do this test if you change the view screen.
I always focus in the center of the view screen then recompose the shot.