I just keep the scruff off the bottom 12-18 inches. The fans will drop naturally. That whole thing about cutting fans for light is a myth, IMO (and others, such as Rosenthal, agree). If you pick fruit (and buds are the fruit of cannabis), you know that you will find some of the juicyest berries hidden under the leaves. The buds themselves don't need special lighting, just the overall plant. The fans actually help the plant to benefit from the lighting and environment; otherwise they wouldn't be there, and in fact do drop as no londer needed.