To resolve the issues with the Leitch DPS-290, I did five back-to-back (Panasonic AG-1980P -> Panasonic DMR-ES10) captures this past Friday night. These new captures are excellent replacements with no visible loss in quality and no randomly-frozen frames. Furthermore, the auto-tracking never changed since I did them back-to-back, so it's far easier to align these five captures than the previous five.

I looked at a scene from Interleave(c1.SeparateFields().SelectEven(), c1.SeparateFields().SelectOdd()).srestore(frate=23.976, omode=6, speed=-25, mode=2) and compared it with the same scene from GOUT. Amazingly, both are exactly 1063 frames. Some of the shot-transitions within the scene are off by one frame, but that can be repaired with AviSynth's FreezeFrame.

Should I still look at QTGMC?

Edit: Also, I was able to get rid of the ugly lefthand-side curve using DeFish(fov=48)!