How many watts do you run your cobs at? I have also found that the results of mixing spectrums is the best. I veg with 4000k, and then move those to a sidelight position, and put 3500k overhead. I run them down low at 40 watts each. I have giant heatsinks so I can really crank them up if needed, but I typically don't. It seems like with cobs, if you turn them up too high, you have to move them far enough away, that the net gain for using more power is totally negated, at least in my space.I used 1 3000k Cob in the small tent. In large tent I have a 3 to 1 ratio of 3000k to 6500k. Basically in a 4x4 space I do 4 to 5 cobs. 1 of them being a 6500k. I like the Blue for the whole grow to be honest. I have had some plants near the 6500k do just as good or better. But they get a mix of the 2 spectrums the whole time. I also have 2 QB96 lights for flower. Mostly Red spectrum and adjustable intensity. They are not on yet. Will wait about 5-7 days. So the WC Is flowering decently. They are strong lights for how small they are.
Loving that WC and your other girls!
cheers
os