Check that CFC relay picks at the end of the run. Think of it as electric stop. It is how Dover decided to use the comp field.
Maybe if it is working try blocking it and see if you recreate your problem.
But I vote on the side of compounding, without a run box , pull INA wire to put on inspection. Use UA1 and DA1 wire contact relays to jog car up and down at inspection speed . The wire diagram for generator is usually inside wire trough. The fine tuning for low speed series field is usually on 10 o’clock and 4 o’clock field pieces.
Composites seem to stop real well even Compounding gets just a little bit off. But once it gets too far out of whack the affect of CFC relay energizing the comp isn’t enough to stop the car floor level.
If you can lock it into low level speed (2LR) then 10-11 foot per minute is ideal.
