You have 3 different miners, that is a little hard to troubleshoot without more info. There is so many things it could be.
I would suggest splitting it up, start with one type of miner and see if you can get it to work. Then move to next miner. Get all 3 to work separate and then try to work together.
Have you tried working on one at a time?
I would move over to U3 on trying to solve problem as it is more power then rest by far. What have you done trying to fix U3?
And when you say u2 acted weird what exactly did it do?