I'm not an expert at thrust vectoring PSM, but I can stabilize the traditional PSM by simply using AoA/AoS in a certain degrees limit.

@TheFlightGuySP is there a way to learn this code lol

@Tornadox31 Yes, that is correct.

@TheFlightGuySP So your basically trying to find a balance, and your trading maneuverability for stability, ok thanks

@Tornadox31 I generally do this: Pitch-(PitchRate×0.005 or number less than one)
All you need to do is replace the pitch input with other control inputs.
The number less than one is used for controlling the sensitivity of the stabilizer. A higher number is more stable (to a certain point), but leads to less maneuverability. The opposite is true for a lower number. You just need to find the middle ground number.

How do you use pitch, yaw, and roll rate

@TheFlightGuySP Agreed, PitchRate,, YawRate, and RollRate are super handy and onl tke a bit of finetuning to get your craft flying great, i just made a thrust vectoring jet with those codes and i really like the outcome of it.

There's more than one method. You can use PID controllers, but that is an expert level method, and very complicated.
I'm fairly certain you can use AngleOfAttack/AngleOfSlip code, which is still complicated, but less complicated than PID controllers.
I use Roll/Pitch/YawRate code. This is one of the easiest methods that can still auto stabilize the thrust vectoring system. For example: "Pitch-(PitchRate*0.005 or any number less than one)" works for stabilizing pitch control output.

@GuyFolk