I don't have a 5.7 Ice, but my 5.3 and down rig fine on my NoLimitz masts. This may sound silly, but did you adjust the batten tension tight enough on the 5.7? Also, I think it was the 2005 sails? the same wrinkles were there on the larger sizes. Wen the sails were under power the wrinkles would go away. Supposedly they were designed to fill out with wind in them. I don't own a 5.7 Ice but my 2010 5.9 Duke doesn't have the wrinkles you're talking about. Anyway, make sure you check the batten tension.