Hey Paulie, our methods are a bit different, you RDWC and my Coco, but our screening and lighting is set up fairly close.
I am interested in you trimming back to 6 mains, keep me informed on that please. I use individual screens, 5 separate plants each has it's own screen. I do this so I can move the plants in and out of the tent to work on them.
As far as pinning them back I have found that the thick
chenille stems work great, they can be bent to your needs an easily attach to the screen.
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Look forward to this next grow of yours and good luck.
GR