[2020] I can't deal damage with any sort of aircraft ammo.

If you want other players to judge the situation and give you some advice, it's always best to provide server replay - so there will be no lag/pl involved.

You can find them here https://warthunder.com/en/tournament/replay/

That means you have a huge lag - most probably your ping is too big.

Try to check on what servers you play and maybe try to limit it to one, where your big is lowest?

That's really strange, 42 is good ping. Dunno why you have such problems with sync between what you see, and server.