@hilly I found the GT1250 really agile and fast, and to be honest I doubt there is much in it between the RS1150. I didn't have a GPS so I can't accurately compare speeds but in terms of fun factor, you couldn't go wrong with either one. Probably at my weight the extra cm2 is what makes it more user friendly/fun, and I doubt there is much in it at the top end. It definitely turns better as smaller only by 25mm, just my 2 cents worth.
I'm just trying to work out the best combo for me and my conditions
1) GT1400/GT1250 and RS1000
2) GT1400/RS1150 and RS1000
3) GT1400/GT1250, RS1150 and RS1000
4) GT1250, RS1150 and RS1000
I haven't tried the FT(S/L)12.5, does it really make a difference if winging only?
What did you mean by overwhelmed here, too much foil? "RS1000 can get overwhelmed when swell is over a head and a half"