Jon,
Congratulations on your maiden !!!! I too completed the maiden of my Viperjet today. The flight overall was very successful with minimal initial trimming required. I have been following this thread as well and went with the two saddle tank, one main tank configuration. I am running a Jetcat P80se with a timer setting of 7.5 minutes. At the end of the flight I too had just barely gotten into the main tank. Back to the take off... The jet tracked very well and came up to speed nicely. The bad news was that it snapped to the right shortly after rotating. The good news was that I was able to catch it and continue on with my flight. I have heard of at least one other who had also experienced this hard snap shortly following rotation. Servos are JR8411, Spektrum AR12120 receiver with all recommended throws on control services. CG is 35mm aft of center wing tube. The jet was a pleasure to fly after catching the snap and settled in nicely. Landing was extremely stable with 1/4" of crow.
Any thoughts on the snap ???
Thx,
Bill