leave the leaves that dont shadow your buds let them turn yellow then give them a tug not to hard just a little tug the leaves provide stored nutes to your flowers you should have some turning yellow that means they are being consumed by the plant this is good unless you have to many leaves falling off then you have a problem i have experimented by taking two clones from the same plant and removing the fan leaves during flowering from one and left them on the other these plants are right next to each other in the same soil same nutes same conditions the result is the plant i removed the leaves from the buds are substantialy smaller and are not as frosty and do not smell as fruity as the other the other ones buds are at least twice as big and smell delicous and are covered in trichomes and just looks better so i hope this helps you out happy growing