BBKs and Peelers

Can anyone comment on how close is too close for the top-most part of the BBK to the inner barrel of the wheel? When I test fitted a peeler around my Brembo GT’s (380mm), it cleared, but just barely, maybe 1mm or 2mm clearance. Is that safe? It looks like if I wanted to run these I would need to get them re-balanced with the weights put on the innermost side of the wheel barrel instead of where Audi puts them, which is the outer most side.