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I think it’s fine to remove almost all the foliage in the bottom two feet if the plants are vigorous - and it sounds as though yours are. But perhaps not until the first tomatoes are at least half size. I always tend to overcrowd my tomato plants and cutting down some of the forest helps air as well as sun get through.
I only ever take the bottom leaves off as and when they start to look a bit tired - they tend to die off naturally.I think some people tend to fight blight by removing all the leaves once there looks like there is a decent amount of toms..