That type of leaf curl is typical of wind stress. Do you have a fan pointing right at it? It should be fine as the tap root gets a little more established.

Once you’ve seen a few truly finished plants you’ll know from across the room. A healthy plant’s calyx should swell to false seed pods as the trichomes are becoming milky white. They’ll go from sparkly clear trichomes to looking like sugar was dumped on them.

Never supplement calcium or magnesium unless one is deficient. You will run into problems using too much calcium. How are you measuring pH? Digital meters will eventually lie causing issues with mineral availability. Never trust them to be accurate.