it would help but 2 600s on a mover would be the ticket.
about 40 parr watts/sq ft.
on the other hand 2 1000s on a mover would be 61 + parr watts/sq ft.
movers can nearly double your yield on a light, yes they work. Another way to dramatically improve gram per watt is to run only half your lights at once and alternate which ones are on/off