I haven't read through this entire thread, but I noticed you have LEDs at 65% intensity. Have you tried lowering the intensity? I have reefbreeders and my whites peak at 20% blues at 50%. They hange 9" awl. With LEDs, IMO sometimes less is more.
A few months at 40% no difference. All frags are still frags on plugs even from 2 years ago. A few new heads here n there. I've had dozens of zoas disappear though so there's that difference lol