Hi
I'm a jet main.
The server says fast vehicles, you get what you joined for. At most they should double the spawn time, personally I think its fine.
The active missile spam is a valid complaint, however 70% of that is nullified with ECM and skyboxing as well as simply smarter flying. Flying low and using cover is a very strong defense against the mobile AA to avoid follow up actives after your ECM runs dry, and as for Lancang, the dam is practically a AA free zone with a giant barrier to pop in and out of and hide behind as well as the surrounding mountains. You should practically never be pushing close to their spawn or close to spawn flags as thats very risky even in normal servers.
A good jet duo can run circles around even the most spammy of AAs, using the stealth as the initial bomb to exhaust APS and allowing your attack jet to laser the AA afterward while it focuses the stealth. Me and my wingman use this tactic religiously and its allowed us to farm the AA over and over. Remember that as a duo, the stealth is always the bait for ground targets allowing the much slower attack jet to mop up after it.
While flying solo, consider learning to play around the AA and not even bother focusing it, play practically across the map from it and it'll barely bother you. The less attention you give the AA, the less its going to zero you instantly. Use your team mates to your advantage, push the AA when you have a friendly tank near it, get that critical movement disable and peace out while you get the assist.
I know you said that you play the attack jet, so another piece of advice is to learn to JDAM from the skybox. Most AAs, even good ones, fold once they get hit with mobility crits and most panic APS right after, which puts them wide open for a off angle strafe into a JDAM. Alternatively, AAs struggle at aiming straight upward, so a go to strat is to fish for a sky bomb crit as most AAs stay completely stationary in common spots and when you land it, swoop high and then top down the AA with guns and finish with another JDAM if needed. If done right, you can kill the AA before it even sees you flying away from the 2nd JDAM.