Shimano 105 and shims

Has anyone any experience of having shims fitted to 105 shifters? I have small hands, and whilst I manage to brake from the hoods, I cannot reach the levers from the drops. I can barely touch the levers never mind pull them! I've heard of shims, but I wonder if they work well, or if by having them, it may cause difficulties then braking from the hoods?
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