I had a 10/14 setup for a year and it sucked. I always needed a 12 for home and hatteras, I share a quiver of xr5 8/10/12 with my wife and its great but if just me would be 12/9.
I agree the simpler the better. Too funny seeing people dragging a foilboard, surfboard and TT plus even different type of kites to match each board style!
If its just the valves leaking then get some aquaseal marine sealant. If you can remove the valves with heat and clean the bladder would be best. Once you aquaseal it then that part will never come off again. I think if you seartch this forum you will get some pictures and more info about this gener...