let the branches in the middle grow a bit in height before u LST them again, if not u will get a lot of small branches in numbers but they wont become very big like the 4 in the corner, just give them another week or two and have the center directly under the light, keep the canopy even with the net you installed (dont let the the 4 big ones grow out of the net until the branches in the middle are at the same height and everything should be fine and even :)
happy growing:)