Just can't seem to get it right

[guruofgardens]

IMHO- too much water and fertilizer. The soil already has chemicals in it, so you're adding too much too soon.

If these were my plants, I'd spend the $$$ to buy a higher end soil like Happy Frog and mix it with the soil you have maybe 2 to 1, dump out your transplants, and replant in the new soil.

Good luck. We've all been there and try to learn from difficulties.