HI Mark,
Not sure about your weight/skill level, but buddy of mine, 82kg? borrowed my 750/900 for his holiday in Greece, barely used the 900 on a very light wind day, says he will only ride the 750 this season, so they do have a lot of power, like most other high aspect foils coming out. Met another customer on the weekend, 100+kg, riding Skybrid/KT downwinder, with bigger Ventis Wings- he was riding the 750 and 900, does not want anything bigger, even for super light winds. But that is offset of course with the big wings.
Personally I/we use the 1100 for light wind testing of 6-12/15 knots on a Skybrid 85/75kg . But actually I could easily take the 900 with the bigger wings, except for when it is really light. So bit of a mixed bag according to weights, skills, wing size, board type..nothing new there really..

From reading your other posts, I am not 100% sure if you need the 1100, but depends on wing/board size?