The jet spawns need to be checked and likely adjusted. Some people have been complaining for a while that there's way too many spawning, but I haven't really experienced that myself yet (outside of defends).
Weird. Usually there is red smoke before the jet even begins the bombing run. If not, it could be Zeus controlled, either way it shouldn't be bombing the same thing that many times.
If friendlies use heavy AT launchers like the enemy, the effect is the same. They both have active protection as well now, so there shouldn't be that much of an advantage for the enemy tanks.
The snipers are meant to be a challenge, they should be a priority target before landing a full heli near them...
The only thing related to difficulty that has been changed in recent months, is the defends, which are now harder. Jets have been the same, and apparently bad for a while. Overall AI difficulty has been the same for 6+ months. I don't know how standard AOs and missions can be perceived as suddenly more difficult?