"Read, heard or somewhere got the guff that the leaf immediately above a fruit cluster is the one that provides it with direct nourishment. Hence when pruning hard, you may take all but those most important leaves, so it goes."
This is what I was taught by someone who had agricultural training at Guelph. That was in the '70's but I have never heard different. If your upper leaves are too big how about compromise by removing only the 1st, or lowest, part of it?
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