Bro, that classical music on the background is a cherry on the top of cake. It gives people chills, inner peace and good mood. Well done bro, continue like that!
The Yak-9UT is really worth trying out at 6.0 It has options for 23, 37, or 45mm cannons, though you lose a 20mm with the last option. I've found that 20mm tracers and 23mm stealth is good for mixed use, while 20mm tracers and 37mm air targets is the best for dogfighting
You should try out the G.55 sottoserie 0, not as CAS but as CAP and the occasional SPAA kill. If you play it safe, you’ll get a free three or four plane kills per game. If you add in something like the AUBL, it’s a free way to get into the air because of air strike.
You should consider turning your throttle to zero when doing dives so you have that extra little time to shoot more bullets and pull away without crashing face first into the ground.