If you get a chance to hold a wa octagon handle, it may help that feeling of your middle finger not touching anything with your pinch grip. My only other advice, besides calling Jon, is not to go all out at first on the knife, but get something a little more economical. You may be thinking, yeah, but I want this knife to last me a lifetime, but seriously, if you get a decent, cheap starter knife that some are recommending here, you'll be able to sell it for most of what it's worth when you figure out more of what you want.
+1. That's what I did and it really was the best way to go.