leaves are important because they absorb the light and co2 and stuff to make the buds grow big.

try leave any healthy leaves on unless there is a good reason to cut em.

maybe rotate the plants a bit or move the lights slightly if you can, the sun goes around and moves its light.
that would be better than cutting leaves to let light thru..

i have no experience with weed, only other plants, but thats what id assume..