I’m using the HLG 550 R spec. im at 24 inches per their specs. I didn’t do some research and I was at 100% but reduced to about 70%. Everyone using them seems to have found the sweet spot between 70 and 80%.
@chriscovey Ok, sometimes too intense of light can significantly harm plants. Sounds like you've got the light distance dialed in. That being said, the pheno just may be a heavy feeder. Maybe try increasing the feeding so runoff PPM is over 1000? You may be able to get away with upwards of 1500 PPM since you're in flowering now (500 scale).
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What nutrients have you fed and how often? How long has the plant been in flowering?
Last feed my ph runoff was 6.1 and ppm runoff was around 900