New SCRoG setup w/pics. Need advice. Screen in place...

I tried posting this in the Newb area, but no reply...so I shall try here.
Everything is going great thus far! Had some issues with the nutes, but have since worked that out. I'm at the point now that I need to introduce the screen...and I need advice.

1st: Do I need to top these plants? They are close to 5 weeks old, and I haven't done it yet.
Screen.jpg

2nd: What the fuck am I doing here?! lol, as these plants are in the middle of the screen, do I want them to grow out to the four corners of the screen? or do I want them to kind of circle around the screen? I have an idea of what needs to be done with the growth, as far as keeping primary growth under the screen. The screen is 3'8"x3'8"
Screen 2.jpg
or
Screen 3.jpg
(sorry for the shitty drawings on the pics)

Would trying to pull (bind) the 4 main stalks closer together help? (so they all start growing from closer to the center?)
Any advice would be very helpful!

Sorry, I'm a total newb here.

The setup is:
4x Femmed Sensi Star
4x 5gl Smart Pots
1x Fresca Sol Platinum
1x 400w MH & 1x 600w HPS (not in use yet)
1x GowLabs 120 4'x4' tent
1x Vortex 6" fan (no filter yet)
1x 750GPH pump (for cooling light) w/55gl water drum
Fox Farms Nutes/Soil (twice a week feeding)
3'8"x3'8" DiY screen (pain in my ass)

5 weeks in on 24hr lights!!!
 
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