I recently build a plane that supposed to be agile fighter plane, however I found that it is quite unstable during sharp turn on low speed (~700lm/h, 49%Thrust, ~400m). The way it flies like rolling like crazy, banking left and right with a strange pattern. This thing can fly with 350km/h, is it something to do with AOA? or I did somethings wrong with the control surface? Any help will be appreciated.

Btw, just found out tradition back thruster's vector thrusting with hinge result in no air intake, is there any post recommend for that issue? Thank you.