I am not an IP owner but am gonna chime in my 2 cents so please take it with a grain of salt and dont bash me. Our boat is a Bombay clipper 31 I have been told predecessor to the Ip31 but she is a heavy stout beamy boat. It performs Great in 15-25. We were out last week for a few days in 9-14 mph winds and averaged about 5 knots, occasionaly up to 6.5 . Having said that I think an Ip 35 would perform similar if not a bit faster and closer pointing. Personally I would rather have a boat hat can handle heavier wind easier then one of those super light (but faster in light wind but have to really reef heavy etc in anything in the mid to high teens) type of boats. We thought of a trawler, but for the extra few knots per hour, and not being able to SAIL
we went a different route. We too are on the west coast of Fl and sail winter and summer. Summer sailing seems to have ok to decent breezes many months, and we enjoy the trip wherever we are going. Most sailors I know of power sail often as winds never seem to come from wherew you want them. Having said that we recently motored 24 miles and burned barely 2 gallons of diesel. I think you can easily get your 3 knots on most points in 5-10.