A couple of things stand-out.
You'll need to find out your water ph. One of those freshwater aquarium test kits are cheap and reliable enough for clear liquids, or you can check online for your local water reports. The ph and dissolved solids info should be there, as well as what is used to chlorinate if applicable. Even if you're using wellwater, they should still have local water quality reports available.

What feeding schedule are you using? The FF bottles are marked for stand-alone dosages, I believe. Their online Weekly Feeding Schedule is solid, and I keep copies in each growroom. (I have them memorized and usuallt I no longer need 'em, but I never know when my next brain fart will occur)
Grow Big and Tiger Bloom have all the micronutes you'll need for a while, and Superthrive is garbage.
Big Bloom is a catalyst tea made to compliment both of the other two nutrients.
Fox Farms Weekly Feeding Schedule
The soluables listed are ultra strong. If you do use 'em, start with 1/4 doses.

Your light is too far from the plant. The usable light from your CFL and fluoro tubes only extends about 6 inches, max. This makes reflectors virtually unhelpful. If the reflector get's in the way of the air circulation, I'd make some changes.

The bigger the pot, the longer it retains moisture. (water)

Potting soil has a big advantage over compost. Mainly in the ph buffering and nutrient content.

I'd check the lighting section to get a handle on your color temp of the bulbs. Using the appropriate bulbs promotes healthy growth.

Gotta run, Amber needs my computer. :thumbsup: