Inconsistent shifting: any ideas?

Fluid level normal.

Manually shifting: starting in Low and shifting to 2 and then to Drive at 5500 rpm.

Driveshaft wasn't balanced right - had that vibration before engine swap. Flex plate specifically for magnum engine to non-magnum TC.

Regarding linkage binding... Wouldn't it always be the same at wide open throttle? As in, cable pulled all the way when pedal to the floor?

Probably have to ask transmission guy about checking governor weights and spool weights. He rebuilt transmission a few years ago.