Answer: I would not try to move them now. I would go on harvesting as the heat of summer will soon be shutting down production anyway.
If you want to provide more light for the crowded vines, you could lean every other vine outward from the row a bit to spread them out (the row would then look like a "V" from the end view). This is accomplished by tying them to a trellis support that leans out.
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