Matt, I heard from John B that you were getting close! My CG is exactly in-between where Anton recommends in the manual. All batteries are up front (2 - 5200 mA Li-ions and 1 - 2750 mA LiPo), gear down, UAT full, and all turbine related equipment is under the turtleneck just behind the cockpit. With this set up I needed to add 3 oz in the nose. Definitely fit the cockpit before doing final CG, this along with a pilot will make it nearly right without adding any additional weight. I made a stand to balance my larger planes without a helper, photo is attached. Set your elevator movement to 25mm, this is perfect for landing with minimal expo. The Viper will balloon on you with too much elevator and expo.

Did you do the mods that were recommended in the various build threads? Specifically the rudder? I also added additional glue to the windsheild as I had one come out in flight several months ago. Not the canopy but the windsheild.

Enjoy your Viperjet! Its a great flying jet.