Fox farms feeding recommendations are generally much much too "hot" though that shouldnt cause drooping, and honestly, they don't really look overfed as of yet..
Drooping is often caused by over OR under watering.
How often are you watering and why are you watering when you do?
Are you sticking to a schedule or are you letting the root zone dry out some between each watering?
Ideally, you should wait as long as you can(within reason) between watering, especially in soil, as to give the roots that wet/dry cycle that they thrive on and allow them sufficient oxygenation.