The A-164 is too fast plane for its purpose. The A-164 is copy of the A-10 (A/C) and it is known plane for its slow speed because it isn't a jet plane and its structure and fuselag doesn't support high speeds.
The plane should have a high maneuverability but low speed. For game purposes limit the top speed to 450-500km/h would be in good balance as TO-199, what is copy of Su-25 should be possible fly almost one Mach, especially when it doesn't have Vikhr loadout slowing it down. Giving a TO-199 the high speed and high acceleration (800-850km/h being max speed) and for A-164 a slow speed and slow acceleration would balance the units.