Mig 9 I-300 vs FS and engine question

[IceFire]

In-game the differences between the I-300 prototype and the MiG-9FS so far as I can tell is in the armament only. The MiG-9 has a N-37 and two NS-23 while the prototype had the larger N-57 cannon and two NS-23s.

It seems that in real life the issues with the cannon causing the engine to stall persisted but in-game only the prototype suffers.

[The Stalker]

I've tested both and they all suffer from the engine failure if firing the nose cannon above 3000m.