I would suggest 5.5" for sure. I have a Flex 3401 and tired out a 5.5" on it this past weekend on a hammered Caddy CTS and it turned out to be one of the best panels. Wish I had more, but had only ordered one to try out. I used the Flex on speed 6, orange 5.5" Erasure pad and Menzerna Powergloss. Yeah, that baby was really cooking, but the paint needed it. As others have stated, going anything bigger is a tradeoff with more time needed to correct.
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