what both of you guys are showing pix of points to possible Mg deficiency. i believe the 4-4-9 (without
floragro) is a little light on the Mg, and higher in P, which might not be best for water culture.
epsom salts could help. or for $$, Fulmag. but it's not necessarily as simple as "more Mg". too much P can cause Mg & other deficiencies. can't find literature to back it up but P is more readily available in straight up water vs. other mediums. if i'm wrong i hope someone corrects me.
what kind of dosages are you using with the dry kool bloom? i'm only using it very sparingly late in the cycle. max .2g/gal and i'll do that halfway thru a batch so it's only in there a few days. regardless, JMcG your buds look awesome. frost all the way down the fans like that always seems to curl the leaves.
JMcG, what are the symptoms that have you lowering the nitrogen? just curious.
Tbone, how often do you change out nutes? do you have a fogger?