Well man, first of all rest in peperonies for the fallen ladies.
in my opinion you didnt do anything wrong except giving up to early. I think if u had let them stand there for 2 more weeks ( it doesnt matter if u would chop them down anyway ) u may would have seen something changing.
But thats normal on the first grow. Everybody needs to learn to be cool, give them their time to grow, dont look to often just chill.
Some thing that also happened to
@TheMongol is that if u look to often at ur plants it gets hard to see any difference.
I think u read that thread from him and know that his girls stopped doing anything for a quiet long time but everytime i visited i saw a difference and told him to chill. Now everything works better than he could every imagine.
Keep your planning up.
Maybe some checkpoints:
- Air ( ofc filtering outgoing air, but maybe filtering the intake too? or at least block anything but air? some air-moving inside? temp ok?huminity ok? is the air fresh?)
- Water ( PH, temp, EC / ppm )
- Soil ( PH, is there any fertilizer in the soil? maybe try one with no or at least low amount of premixed fertilizers )
- Light ( try to make best use of coverage, dont be too close / much away)
- make a list what u do when u do
- chill and give them time