Hi crashburn69, if you are using grass runways the nose up angle you have may actualy help,
I have trained a lot of people on the Avistar, personaly its one of my favorites to train on, and I do recomend it to everyone who asks. I think you may like it alittle nose heavy, I dont think I have ever seen a Avistar that needed weight to be balanced, not to say yours doesnt.If it does I would try to relocate the rx battery, you can get that sucker behind the radio tray with a little finagling.
You will not only have a lot of fun training on the Avistar, once you learn, the plane is capable of a lot of fun stuff.
Good Luck Dude!
Never add weight to a plane unless it is absolutly necessary