Halikus

Nice looking buds. I started a year ago and did a batch of Mandarin Cookies under some blurples with different nm extras using hempys and the buds were super frosty and looked amazing under the redblue bud the yield was lacking. A year later after experimenting with other strains and getting into RDWC i have a really close setup to you. 2 x QB288 with 660, a 5x5, trellis, GH nutes, and 2 x Mandarin Cookies and 2 x Cresendo RBX1 (by ETHOS and derived from MC) in an undercurrent RDWC. I'm in week 6 of flower in 1 tent and week 4 of veg in another and am trying to do an 8 week8week perpetual as close as i can do it. In the veg i'm using the old blurple using the primarily blue veg setting and topping them often and the canopy is staying very even wheras the first batch was more of a dome shape that sucked in stretch without training. I find PH usually rises in veg and drops in flower. In flower i believe it's because it's using alot of 1 nutrient and the bi product is a lower PH. Mine drops daily to 5.5 easily around week 5 after i set it to 5.8-6 daily and it does that for a week or so. I have similar yellow leaves that i think may have to do with our lights and was wondering if it was a slight calmag def caused by the LEDs (they cause them to eat it up). Also, i have been screwing around with a few supplemental lights. One of interest to you may be 730nm. Without overexplaining things the 730nm mixed with the 660nms caused the emerson effect and seems to be helping a bit. At lights out i use only the 730nm for 10 minutes and it puts the plants to "sleep" quicker so i run a 13/11 light schedule. It seemed to speed up the transition week and my day 36 of flower looks like your mid 40s. It can cause stretch though so next round i was going to supplement some royal blues the first 2 weeks of flower. 660nm alone will cause stretch, but i believe adding the 730s kind of cancels itself out as far as red stretch goes. I started adding the extra lights as i could afford them so my results are inconclusive lol. Also, i'm using some UVA that may or may not be adding to the frostiness. My arm smells nice when you brush the plant :)