I faced the same problem with my Tangerine Dream... and I LST'd the hell out of it all the way up to about 2 weeks before harvest. I eventually decided that since I wasn't getting any burn on anything that they were ok even 2 inches from the lights... One of my LST efforts ended up being HST - and that was the main cola!! Didn't bother it... they're amazing plants. If you're not seeing any burn or any problem with the grow other than YOU think they're getting too close to the light, I wouldn't worry all that much. Your grow looks amazing... just keep pulling the taller ones out more - it will give you a MUCH better harvest as you'll be getting light to the lower bud sites.
Good luck!