As I understand, our resident float expert, Paul S from Wisconsin, flys his model 4 on 1100 amphibs and while slightly under floated , his Kitfox performs admirably with an 80 hp Rotax both in take off and cruise. Given a little time he may see this post and respond as he so kindly does for most Kitfox float questions. Please try searching the archives in the meantime for float topics and Paul’s responses in past posts will be very enlightening. Best of luck and welcome to the forums. Hope you are float flying real soon.