I added a metric crapton of heavy struts (220.000 strength) to reinforce the fuselage, wings and booms and it cannot break. I did a 180 on elevators at Mach 1.5 and it did not disintegrate, I consider that a success. I will put up screenshots of the CoM and CoL as well as flight data soon. Also, would adding Lerx (canards that control the airflow) work in FAR and reduce the stalling issues? EDIT: Added canards beside the nose, rotated the rear stabilizers so it faced downwards at 45° and added wing-tips to the wings. Still stalls on elevator turns and pitches up if I turn off SAS. Link to album of stalling screenshots and CoM, CoL and CoT.