Finishing fast is nice, but finishing strong is king! Cannabis takes so much time and care to grow, harvest, trim, dry, and cure that it's a drop in the bucket to be a few days or a week behind here or there imo. Hopefully your sprouts rebound with some food, I'll be interested to see how it grows because I haven't grown anything minty myself so far.
I think mountaintop mint shows some variation because it's the clone-only Bling (the seeds for the Bling are S1s, but there's no reason for them not to work with the clone if they have it) crossed with MAC Mints for the F1, selected and backcrossed once, so I believe that should be (The Bling x MAC Mints) x MAC Mints = mountaintop mint Bx1. Or maybe (The Bling x MAC Mints) x The Bling? I'm not sure which one they backcrossed with, it would be whichever they're trying to isolate traits from