Defoliate?

I’m growing 5 autos in 5 gal grow bags, three in the front are a couple weeks ahead of the two in the back. Should I defoliate a little to let bud sites have more light? The two in the back are in early pre flower stage and the three up front have been in pre flower/flower for the last 3 weeks give or take. Any other tips to max out the yield? 4 gorilla cookie autos and 1 (back left) z auto. I know it’s a little crowded too, oops. 3x3 tent.