Azir, The Vision Regained
Riot, You state that Azir's nerfs have hit him pretty hard, but you don't really seem to be doing things that help Azir's original vision of a strong AA long range commanding mage. Right now, Azir players use his Q+AA with a soldier to burst down opponents, and AS isn't even bothered to get obtained really.
You want Azir to be an AP based AA hyper carry right? Then here are changes you need to do.
NERFS Q: Reduce the base damage, the AP scaling W: Make his soldiers only last 1-2 seconds under tower. remove the effect of nuking towers with it, Buffs: STATS: Buff his base AS to 6.25, Buff his AS/lvl to 2% PASSIVE: Increase the CDR->AS ratio from 1.25% to 1.75% Q: Reduce the cooldown so it's easier to reposition his soldiers W: Allow his Soldiers to attack towers, dealing 25% damage to them, Enhance the damage/lvl gained on the soldiers making them stronger at level 18.
You wanted Azir to be a champ that uses his soldiers to zone out his opponents and can easily command a legion of soldiers, and use them for his attacks, but right now, he's simply a burst mage from long range. The best way to change that, is to nerf his damage on his Q, and make it focused on keeping opponents in range for his soldier's attacks and maneuvering them. You want him to be a hyperscaling AP carry focused on Autos, then reduce his early game soldier damage, ramp up it's scaling so that it does more damage at levels 14-15 onward, increase his AS and the AS per level.
Exact change for his W soldier damage should change from 45+5/lvl to level 12 then +10 after that to 20+5/lvl to level 9 +15 from there to level 15 then+30/lvl to level 18 [This makes his damage 25/30/35/40/45/50/55/60/65/80/95/110/125/140/170/200/230/260] and leave the .6 AP ratio on the soldier damage. This makes hims stronger late game with his AAs, and reduces his damage and makes it more dependant on his AA damage rather than, Q-AA single burst damage.
Riot wants Azir to be a commander champion that uses his soldiers to deal his damage, if they want him to really be focused on his soldiers and their AUTOS, then they need to nerf his Q, and buff his AS, his soldier W damage late game, and make Azir able to constantly maneuver his soldiers to keep them in range for autos.