Hi I'm flying my 2nd avistar. My first had your setup and the clamps worked just fine however get some machine screws and the ball tipped allen wreches and it will make it a lot easier to do maitenence. Also make sure to use lock tight on the bolts. I have flown with a few props (10x6, 10 7 amd 11x7.5 )and the 11x7.5 was the best. It flies real slooow but it also has plenty of power to get you out of trouble
I have the OS 46La and I can't say enough good things about it.It has planty of power, it's quite, very dependable and with very little messing around it has never failed me. It would take me longer to tell you how easy it starts then to actually start it. I'm flying a second avistar which has the plastic wing tips and it seems more agile than the first. THe first crashed because of pilot error when I was messing around trying to make turns using only rudder and throttle. It flipped over on its back from about 20 feet up and I instinctivly pulled back on the elevator and it went straight in. The fuselage was in tough shape but the wing survived so I decided to get a second. Over all I am happy with the plane and would recommend it but I have been told its more and intermediate trainer and now that I have some expirience under my belt, I tend to agree.Good luck with it