I think a little magnesium might help. The darker veins in relation to the paler leaf can be a sign of mag or potassium deficiency. Since you just re-potted to a quality soil it doesn't make sense that it would be any type of deficiency though. Is it an auto?
Maybe a tad of transplant shock? Or ph in root zone is not right imo. Like crucialbunny said doubt it is a deficiency as new soil. I normally dont do runoff test in fabric pots as i get salt deposits on outside of pot later into grow which taints runoff ph but since you just put them in it might be ok to test to see what ph is in root zone. Just spit-balling.
It's to soon to tell after transplant, add a little cal-mag to your water cycle. make sure to raise your pot for air flow underneath. and give her a week or two to snap out of it. She'll flower when she's ready, and I give autos light 24/7. Patience.
Patience pays off with autos, just chillax dude you'll see.