Hey there Buck... sub'd for flowers!
I run the VERO 29 COBs @ 3K for VEG and flower rooms. I mix in some red light with them in flower. VEG is off the charts since install. Now all plants coming out of VEG are @ 5.5 - 6' tall when flowering... so good height and great mass coming out of VEG. A HUGE improvement for me.
Sorry to hear about your mite issue. Anyone that grows indoors at this level usually gets them. Treatment is a must. Your RH is pretty high, I start to worry and PM and that's a lot harder to fix than bugs.
I've had good result using Neem oil AND Take Down .... (both organic as I'm an organic soil grower). Mites adapt to the same treatments over time. So multi pronged attack is what works. Keep temps low as you can ... 90F daytime temps is what they like for eggs to hatch.
I dig your power board you built, that's awesome. Only thing I'm wondering about is the timer you use. Are you running 1500W thru that one powerstrip/timer?
If so I've had to throw more than a few of them away after failures and went to 20A pool pump timers and switches.