We have mostly XR2LW Core Riot kites at our surf beach
Three 19m2...two 17m2..two 15m2
We all ride surfboards with the 3m extensions (24+3=27m)
Each and everyone raves about the size they own
We have found only 1 knot difference of low end in between them
If you want to be powered up (parked) all the way down to 10kn the 15m2 is it
At 9kn those on the 15m2 need to sine (and it does sine really fast) when in surf conditions
The 17m2 (parked) goes down to 9kn and at 8kn need to sine
The 19m2 (parked) goes down to 8kn and at 7kn need to sine
Those observations were compiled using LW Quad surboards
If that sounds good to you go for it