I have the fiberglass F-35 Lowel had and here is only short video of it... he mentioned the tail has tendency to dance a little but when I had Billy Edwards fly it we saw none and no change when he used flaps or gear he was petty happy...now that I read this I will watch to see what happens with yours mine is just sitting cause I keep getting involved in other Jets ... 40 sec. mark
https://www.youtube.com/watch?v=O0NJga6stdE