Good advice C.P., a couple of other suggestion's for you geeter
you don't need to handlaunch at full throttle, there is a lot of torque with a high kv motor , mine will flip almost inverted if I launch at more than 1/2 throttle {3200kv on 4cells}
don't try to throw the plane at an extreme angle, maybe 10 or 20 degrees above horizontal
make sure your elevons are aligned with the wing, then give yourself 3 or 4 click's of right trim {i'm assuming it is rolling left on launch from torque}
I hope this help's you out ..have fun