i see, i'll go experiment with it @TheFlightGuySP
the craft already has 3D TVC built-in, with basically every engine that generates propulsion being attached to the nozzle, however it barely even adds anything @Griffon1

A simple answer would be to add thrust vectoring, but in order to do that you'd need to build your own nozzle and that might take some time.
But it should give a little bit of extra edge to your turning abilities and greatly help with your low speed handling. That and bring it down to low speed, hit the AB and which it do an Ace Combat flip!

@JeskoGoesVROOM To address the first question, I'm not familiar with the older method, so I wouldn't fully understand how to make the input work in that scenario.
To address the CoM/CoL issue, I find that rather odd, but I suppose the thing to do would be to find the middle ground on the maneuverability spectrum (find at what balance point the maneuverability is at its greatest).

i forgot to mention, the craft uses a hybrid combo of both real rotating surfaces (i.e. wings hidden inside custom airfoil design) and the old-school hidden wings inside body tactic, got any idea how to make that work?
also, it may or may not be due to this exact setup, but moving the CoM closer to CoL actually decreases the turn rate lol
@TheFlightGuySP

i'll try that, thanks!
@TheFlightGuySP

I would move the CoM farther back towards the CoL, but not to the point that the aircraft is uncontrollable.
I would also add some code to the pitch controls to prevent flipping at higher speeds while performing aerobatic maneuvers. "Pitch-(PitchRate*number less than one)" should work, but you will need to modify the number less than one (perhaps to something around 0.005 or 0.01).