So in the end I went for a velo90 instead of the katana 97. I think it was definitely the right choice. I've since flown the katana also and the velo is 100% better as a safe and effective a wing.
Also recently had a go on a couple of sizes of JFX and that again is a huge improvement on the Velo, although maybe not quite as fun and 'seat of your pants' to fly.
ciao all, wishing you all good landings Why ask what height one starts one's turn? It would appear considerably more important at what height one decides to finish it.