I think the light weapons aren't classified as AV but "Launchers" in which case you have SL, PC, MD, and [Amarr pending].

Still, I'm curious to see what Amarr is gonna get.

Tanks are OP? Sure would be nice if we had more AV options...

3 words:

Portable Tachyon Cannon.

Consider this.

Supose we give minmatar the -20%/+20% that swarms have, and make caldari -10%/+10% profile for swarm launchers? Traditionally, Caldari are about kinetic damage, so the swarm launcher could be more about penetrating shields and armor rather than blowing it apart.

Now for Minmatar, have their AV be a bazooka type weapon with the -20%/+20% profile, with one shot, then a reload, but no charge up time like the plasma cannon.

Amarr AV you described perfectly. No change I would make.

Logibro posted that Swarm, Plasma Cannon, and MD are all listed as "Launcher", but that it doesn't preclude an actual Minmatar AV weapon... but doesn't mean they're make one either. The fact the Amarr don't have an AV weapon OR a launcher implies that they will make something like that?

So, a possible late edit to this could suggest... "Where's the Amarr Launcher" though that seems overly simplistic, and clashes with what our original vision of Amarr AV would be.

I suppose some sort of Khanid Heavy Assault Missile or Rocket Launcher is technically within the scope of Amarr?

We already have five AV weapons.
Three are Caldari - Swarmer, AV grenade and FG
One is Gallente - PLC
One is Minmatar - REs

Each has different strengths and weaknesses. AV grenades have low range and fill the grenade slot. FGs require a heavy frame and have a large charge time. PLCs are hard to aim. Swarmers aim themselves and have huge knockback, but not much firepower. REs kill absolutely anything, but their effective use requires either about six seconds of melee range or suicide.
Sure, AV in general is underpowered, but we already have a nice selection. I'd prefer if the fourth launcher was not an AV weapon, considering that two already are.

So, in your world, the Amarr just never bothered making an AV weapon? These were supposed to be entirely separate civilizations at one point. It defies reason that a culture wouldn't bother with ANY AV weapons. The Amarr find an opponent with vehicles? Darn... send the infantry home.

Racial parity is an end unto itself not just for balance reasons, but for logical ones.

I never said that Amarr shouldn't have an AV weapon.
Only that the quantity of AV equipment is already plentiful.

I totally expect an AV weapon for Amarr. Or a weapon that has AV as secondary effect, similar to how the PLC has anti-infantry as its side-role.

Edit:
Vehicles have weak points. (Your modifier changes when you aim at them)
What if Amarr had a weapon that was mainly anti-infantry, but gained a huge modifier for attacking those weak points?
It's totally in line of the "hard to handle but hideously strong" design philosophy of weapons like the Scrambler Rifle.
So what if the Laser Rifle gained that role?

ccp cant even balance out 1 vehicle with 2 available weapons... can you imagine the chaos???