I will definitely use them because i have them
But if there's a section on my canopy thats grown taller than the rest, i'll take them off for that section. 6inches bare or with reflector, it didnt matter as it was my first run with LED. I just wanted no shadow spots and was waiting to see bleached leaves/bud (however it never happened).
I'll probably raise them with my next run for even more uniformity and better spread though.
Also, note that my growing area is quite large so my method doesn't apply to most of you. 12ft x 17ft. So i'm aiming the LED's at the edge on an angle.