Y3 Tilt VTOL Take-off

Hello, I’m working on a VTOL Tri copter project.

I’m facing some challenges with the pitch stability during take-off. The aircraft tends to wobble and tilt a lot. And its not holding the position in Qloiter mode. I have uploaded the log and flying video of the aircraft for your reference. I would really appreciate it if you could help me figure out what’s causing this problem and how to fix it.

Thank you so much for your time and support.

FC-Matek-F405-se

Drive Link Video&Log