2s 85mm whoop flight issue

[digital bear]

Hey guys, I recently built a 85mm 2s whoop (basically a mob 8) with parts that I had lying around, I'm using the mobula 8 frame and canopy, tbs unify pro nano vtx, 11000kv motors and the Darwin 2-3s aio FC . I have the vtx taped to the to of the fc and the rx receiver taped to the bottom of the fc. When I arm the whoop it instantly flies away and once its in the air when I go to 0% throttle it stays in the air and doesnt go down, and sometimes it jolts up and down its really unstable. I have tried the default betaflight settings, mobula 8 pid and other whoop pids none of them have worked so far. Anyone had this experience before or know what is causing this?? I would really appreciate help as I'm completely stuck on what to try next

[cerulean fractal]

Could we have a dvr ?

[digital bear]

Okay so I literally just figured out and it was the most random thing ever

I put some more rubber on the fc to lessen the vibration but it was still freaking out

Noticed that I only put one screw in two motors