I have 12 flights on my YA F-15 and have been very happy with it. I'm running a Kingtech 140 and also have the hot spot underneath you reported. It bubbled the paint but has not worsened, so I've left it. The main gear does have springs. I replaced them for stronger springs. My plane would bottom out when fueled.
I was also surprised at the amount of throttle it takes (I fly around 80-85%).
Last edited by bushong572; 09-17-2017 at 04:31 PM.