The #1 thing that needs to be accounted for with a proper SCROG is plant to screen ratio. You can't throw 20 gallons of soil below a 4'x4' screen, with 4 plants at 5gal and expect a tight grip on the screen from each (they only get 2'^2). You could go 1 in 20g and veg it for a while because before the switch all the main tops will have run under 8"+ of screen.
Still, there's nothing wrong with putting a ton of plants/medium under a screen with minimal weaving because the screen is still awesome support, and grants a great net to tie down to.
People always ask about veg/flip timing required for that optimal scrog experience, but the main mental image you need to form is of the chutes between the medium and the screen.
-How many plants do I have, and with that accounted for, how far horizontal can I run my chutes.
---Too many plants and there's no chance to weave horizontal because they're already on each other.
Personally I believe that the best SCROG method is grabbing 4x4 w/ 600w, or 5x5 w/ 1000w. Throw 1 plant in a 20gal+ DWC and veg it until the screen is just over half full, then flip. The yield that setup will make the extra veg days well worth it.