I don't have a permanent residence or the funds to experiment with hydro. My last run was with vermiculite and perlite drain-to-waste and it fared far better than any potting soil I've used thus far plus the fruits of my labor didn't taste like moss.
Disregarding the insecticide as a cause, I would surmise that your plants are unhappy due to fluctuating pH and nourishment. Given your light source, 4tsp TB and 2tsp CM+ is an ample amount. Feed every watering with 1/3 of that amount or feed full strength every third watering. But first...
~10 week strain
Tiger Bloom + Cal-Mag+ are sufficient. Big Bloom is really not needed.
http://agr.wa.gov/PestFert/Fertilizers/FertDB/prodinfo.aspx?pname=3629
http://agr.wa.gov/PestFert/Fertilizers/FertDB/prodinfo.aspx?pname=4295
Difficult to see the symptoms with HPS lighting. What's the...
Seed starting mix has no nutrients so you need to feed them. Are all those lights 6500K? MJ likes the red spectrum better. 2700K is the best when using fluorescents because fluorescent is wide-spectrum so there's plenty of blue for strong growth.
What nutrients are you using, what's the pH of the run-off and how many weeks into flower is the plant?
If the answer is miracle gro, don't know and roughly 6 weeks then that's normal. =)
I recently purchased a wattage meter and tested these store bought CFLs and here are my results:
~100hrs use
Lights of America 26W 5300K (1) - 25W
Lights of America 26W 5300K (2) - 25W
~1000hrs use
Bright Effects 65W 2700K (1) - 60W
Bright Effects 65W 2700K (2) - 47W
General Electric 26W...
I didn't like the growth from 6500k cfl's although they were only 26w. Cool white and warm white is all I use now: 42w 2700k for veg, 45w 4100k for moms and clone rooting, 65w 2700k for flower.