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Ive ridden them for years and was fine with them but ive got knee issues and my shoulder tenses alot on rides, both of which begin to hurt more as I get older so I got the bike fit and, hey presto! everything makes sense now.
my 281 has a 55 top tube and I would imagine the 381 is very similar though will measure it in a bit (cant find the geo chart). I basically need a 52.5/52 frame. I'm 5'7/5'8
@punkture In terms of too big, were you still comfortable on the M's? What actual size is your KG381, they were sold with 1cm increments, or at least the couple I had were? And er, how tall are you?