Leaves point down/slow growth/ maybe rootbound or root rot? Did I fuck up transplanting too soon?

That's not enough to cause what you see. You need more perlite in your medium. (or similkar amendment improving drainage and aeration. 50% in high capacity medium like peat moss or soil and you can do 2:1 in coco (70/30 is often found pre-mixed and close enough) They look hungry. cotys are paling from tip-in... needs nitrogen at the least. watering habits: water entire pot... top layer dries, repeat. stick to that for a consistent wet-dry cycle. it promotes deep roots and reduces superficial roots. shouldn't see roots in top 1" if you do it right, barring a very extended stay in the pot, lol. get it fed right / watered correctly.. probably gonna be droopy after every irrigation with lack of drainage amendment, but if not that's good. nothing you can do about that part. then re-assess the droop. definitely not root rot. they look lily white. a few laps around is not rootbound. I've had a plant in a solo cup for 6 months before, lol.. it wasn't until late month 3 or into 4 that it started to show issues with nutrients. Not recommended, but shows how long it takes for a properly fed plant to show signs of being rootbound.

Your roots actually look pretty strong. My Best guesses with the symptoms you described is Root bounding or Overwatering. I usually avoid starting in such small pots, as they dry out very quickly. Which can lead to under or overwatering and they don't provide many benefits. They don't stay in the perfect range for long without frequent watering. If that is the case it may take 2-3 days to see signs of re-greening. Best of luck and Happy Growing.

For the next time transplant a bit faster. When I see the first roots at the bottom I transplant straight away to prevent rootbound. But for now you want to water more away from the plant on the outside of the pot. This will force the roots to search for the water and develop a healthier and larger rootsystem while doing this.