well, if new lights are much stonger, the wilt could be from that, but not likely the purple petioles.
the purple can be from stress but also a P-deficiency. often happens with LED, i believe. could also be genetic and perfectly fine. can try adjusting ratios a bit and see if a little extra P helps or hurts.
since soil is soaked, i bet it's the new lights making it cower a bit. they'll handle more with a bigger root system and canopy.