When to stop messing about after flowering? ScrOG

You can certainly continue to move the branches to keep the canopy even - but there will come a time when you'll just know they don't need to be moved any more and need to start just growing up straight... Since you've scrogged, you should also start removing leaves/smaller bud sites that sit below your scrog net (called lollipopping) as they will never get enough light to produce anything and are simply taking away energy that can be put into the canopy and major bud sites... Good luck - looking great so far!