Anti air launcher buff NEEDED

So I completed about 90% of the season 2 battle pass but narrowly missed getting the new AR, the VCR2, this has led me to having to try and complete the season 2 catch up challenges, for which I have to take down or support in taking down 5 enemy aircraft with the IGLA. 

Firstly this a very odd choice of a challenge to attach to the unlock of an assault rifle, an anti air engineer challenge, why not 100 kills with ARs for example. 

Secondly the challenge clearly does not track correctly as in my tedious struggle to complete the challenge I got 2 vehicle destroy supports but the challenge still says 0/5

Thirdly and most importantly, something needs to be done about the lack of usefulness of the anti air launchers and aircrafts overpowered resilience to lock on missiles. If you arent coordinating with a full squad, two engineers trying to shoot down aircraft, a support for ammo bag to resupply rockets & a recon it is nigh in impossible to take down an aircraft playing solo with the igla (been a while since I used the stinger but can imagine its much the same) .

In amongst my multiple hours attempting this challenge, I Hit a little bird dead on as it was flying towards me, only taking it to about 5% health instead of destroying it, flaming but no loss of controls, so a damage buff is clearly necessary

I also believe flare reload times need to be lengthened, especially on jets, as experienced pilots just do big circle straying runs and by the time they've circled round the flares are ready again, or potentially have a set number to use and are recovered over time similar to the TOW missiles on the IFV to prevent over use. 

The "out of range" lock on distance needs to be removed or made longer, irl a stinger can lock on up to 5km away but in game past 1000m it's just unable.

I main support but play a good amount of engi, usually whilst tanking and I can see no gameplay appeal at all as to why anyone would ever run anti air launchers as I have more luck hitting aircraft with tow missiles and rpgs on the fly than specifically designating several whole rounds of escalation only using the anti air launchers.

I know this is a bit of a rant but as someone who's played battlefield as their sole FPS since late BC2/BF3 release, I cant remember the last time I got this annoyed at the game, the first time i've ever become so frustrated i've gone to the extent of finding somewhere to lodge a complaint and make suggestions. Whether it be flare/lock on loss  nerfs or launcher damage/lock on buffs something needs to be done about this as at current they are useless.

And all of this just cause I wanted to use the new gun.