Sorry to hear about that .. MF delay is my fav delay I’ve tried & the only pedal I haven’t sold. Can’t really help you but if you plug a stereo trs jack into the expression input it increase the feedback repeats, see if feedback has more effect, also ‘time’ up to 12 o’clock is more slapback / reverb so test past 1 with the ‘mix’ past 11, however I’m guessing you’ve tried this already.
Hopefully you’ll get it sorted, it’s a great pedal, I’ve got it linked to a trails looper & added a ‘ramp’ button (Zander Circuitry Little Monster) rather than an expression pedal.