GSC Week 7 Flowering - Normal or Def?

Hey guys, I'm just curious if anyone has any ideas on how I can improve these last few weeks of flowering (although it may be too late). This is my Girl Scout cookies in week 7 of flowering. It looks like the edges of the sugar leaves are turning purple and there is a lot of canoeing/taco'ing going on. I've been following a feeding chart from another website and it was going quite well. So well that I stopped even measuring ppm. Obviously all strains aren't the same, but with the same nutes and everything my blueberry is doing great.

Strain: GSC - Week 7 Flowering
Nutes: GH Floraseries- 1/2 tsp Micro/gal, 3/4 tsp bloom/gal, 1/2 tsp calmag/gal. (I stopped feeding gro a week and a half ago)
Temp: 70-73 degrees F
Humidity: 43-45%
Medium: Coco coir
Lights: Cree CXB3590 x 4 (COB LEDs) ~ 24" from tops

I just moved the lights up another couple of inches incase it is due to lumen stress.

looks like they are starting to turn
I'd back off on the feed a bit as I can see a bit of burn on the leaf tips & edges
do you pan on flushing ?? as at 7 weeks in and the colour starting to change says maybe 10 - 14 days till they are ready
don't think its light burn as I see that often with restricted area my plants get close to the cool shades and you get a white bleaching in the bud & leafs

I love this thread. It is super well maintained and well documented with pictures.

Yeah the pics lol