Dude all you do is bitch like a sister!!! We are trying to help you here and calm the heck down and regroup and figure out what the case really is. Why don't you just pick a rockwool or rapid rooters and try that out and I am sure they will make a big difference. Everyone's system is different plus your friend that is growing trees with rapid rooters in rw has probably had problems with them in the begining until he figured how to use it properly. Instead of using rapid rooters why don't you use the RW plugs that are made to fit in that hole? I am pretty sure that is the problem and they look fine!!!! just a few errors as long as you fix it and find the problem now then the rest of the growing will be green don't worry about the yellowing on the bottom they will never turn back green. Once the plant is in shock it will take time to recover so let it do it own thing and quit messing with it too much. Use the KISS method. What are you feeding it now?
Edit: Sorry to be blunt, I just don't like whiners. "What doesn't kill you, only makes you stronger"