Neither APDS removal nor raising its BR will “balance” the Falcon. The problem is not with the vehicle.
The problem is the community screaming that SPAAG kill tanks at all. Yes, I am dead serious. Why? Because current War Thunder gameplay for all gun-armed SPAAG encourages, if not outright requires that SPAAG engage tanks to be considered “effective.”
SPAAGs at any BR can only react to incoming planes and not be proactive against them, as planes can just run away at will. Yet planes know exactly where SPAAGs typically are - cowering in their own spawn. For the average player, SPAAGs are perceived as too weak to move beyond their own spawn unless 1) they can kill tanks easily or 2) they are cap-rushing in a very fast one to get a plane quick. Moving an AA around the map expecting to kill tanks also happens to make said AA more effective vs planes, because your AA is now exactly where CAS do not expect it to be, allowing you to surprise and rip them apart before they can react. But oftentimes, in order to reach such locations, you’re going to have to kill a tank or few in order to secure your position before looking for planes to kill, because nothing attracts enemy tanks faster than seeing an AA’s tracer stream or hearing one firing nearby (“monke SEE free kill” “neuron activation” meme).
Snail has been trying to “balans” SPAAG for years by nerfing their anti-tank capabilities - it hasn’t worked, at all, because it can’t. You aren’t going to make people use a particular vehicle in a particular way by disincentivizing them from using it in any way else, especially when those unconventional ways are being practically demanded by current gameplay. All you get is people either using them wrong (sitting in their own spawn uselessly where CAS expects them to be) or not be played at all.
I firmly believe that it’s overdue to completely reverse course on this issue and force the community to accept it. Because more anti-tank capability nerfs will not fix any problem with SPAAG, and even buffing their ability to swat down planes will have limited impact when they all sit in their damn spawn!
Essentially, I’m proposing giving every SPAAG that is possible to be the “2S38 treatment.” Expect them to hunt tanks. Give them any and all missing rounds to do so. Undo old idiotic nerfs to autocannon APDS, all APCR, SPAAG belt compositions, and SPAAG AP(FS)DS ammo count limits. ALSO enhance their ability to kill aircraft (short-ish range lead markers for ones without radar, actual AA gunsights, etc), and intentionally put them at BRs where them killing tanks is seen as completely and utterly normal.
And if someone complains, ignore them. Because it should be painfully obvious that said people will always find something else to complain about the moment whatever they were doing so with gets butchered, leaving the rest of us to pick up the pieces.