I haven't read through the entire thread yet, but I've had several "hard life" vintage tall case clocks that would also run great on the test stand, but fail when installed in the case (post overhaul, all the pivots, bushings, cams, levers, wheels, pinions are correct). Check the movement seat board in the case. Sometimes these old German chiming movements had the seat board screws installed really, really tight, to the point where the seat board is grooved from the bottom of the plates. Try turning the seat board over, if possible, to get a completely flat, smooth, unused surface, and don't tighten the mounting screws more than "finger tight." Wear grooves in the case seat board could combine with the overly tight seat board mounting screws to "rack" the plates.