Unless there is a health issue with the leaves or it is causing poor air circulation through the plant leading to mold problems, leave them on. The plant will draw nutes out of leaf it needs to put out the bumber crop you desire, removing leaves also removes food and energy source to the plant. If you are like the majority of growers here you are probably cutting way way back on N now also. If this is the case removing leaves is basically starving the plant to death by consuming itself.
Just my two cents Good Luck