Try to turn the motor by hand. If it turns easily the motor might be worn out and drifting after the power is cut to it. I have a Dr Who here and I could not turn it one handed. It wont hurt to check it

I watched the video(s) and what I saw in the second one doesn't seem correct. When you pulled up on the MPF the cam turned a little. It shouldn't do that. You have some slop in either the gearbox or the motor or both from what I saw. I am working on one now and if I take my hand and try to turn the cam I get about 1/16" of play in it. See if yours is similar.

I have mine out at the moment doing some cleaning and re-rubbering under the ramps. As soon as I get it back in I can let you know if no one gets back to you till then.

The one I have here measures 1 7/8" from the top of the playfield to the top of the MPF. This particular one has the (3) Cliffy protectors, mini and regular playfields but should be close.