I find it unlikely that the trimpots don't have anymore hard stops... but since they are small and fragile, did you by accident turned them past the end stop?
anyway, since the trimpot has 3 connectors, the side with the 2 is considered down, or south, or 6 o'clock. the moving part should also have some indicator where the center is. the trimpot has a movement that ranges from 7 o'clock all the way around to 5 o'clock, taking the metaphor of a clock face.
the normal setting for the steppers is around half past 9 o'clock, or 9.30, 9 is probably OK, 10 is probably on the higher end. do not tur