,did you have a look at switchkites?
good quality manufacturing, good quality materials, for example the 9 m method can be compared with your kahoona, ,but surely Element and Nitro are top kites for what you want/ need too!
the Method is positioned as their wavekite, but believe me it gives you a lot of fun too on chop!
all are powerfull kites
I have methods and my friend kahoona, soo we fly each others kite once in a while...so that is why I know the difference from kahona and method
good dluck with you choise!
have a look it does not costs you anything