With big wings you really don't benefit much from the bigger kites. (80kg, spitfire, custom xlw wing, style freestyle, staps and strapless
I can kite 19m R1V2 when the kite stays in the air moving. (too low wind to keep it in 12 a clock), about 4 knots. I would not call this enjoyable though
15m is ideal for me between 6 - 8 knots
12m is ideal 8-9 knots.
10 i use from 10-14 knots.
8m i use from 14-16knots
6m I use above 16 knots.
With straps and small wings for jumping
19m for anythin below 12 knots
15m from 12 to 15 knots
12m for 15-18 knots
I mostly use 10m just because i like the size. However 19m is pretty much impossible to relaunch (in 4knots). So you just need to keep it dry. Otherwise you swim. I swim a lot