There are a few problems with Aero as a lead
Pro's
Fast taunter
Fastest non scarf'd Stealth rocker
Sandstorm immunity
Con's
-Is 2HKO'd by all of the common leads
-Can do very little other than Taunt + set up SR
-Always loses to Fake out leads
-SR weakness + Low def means it will not be switching in to counter very much, even more so as it lacks the power to Kill things it can switch in on.
As a lead It loses to :Swampert, Bronzong, Metagross, Lead Infernape with fakeout/Priority, Gallade ( Close combat + Shadow sneak ), Scizor ) Bullet punch ), Lucario ( extreme speed ), Arcanine et cetera, the list goes on.
I don't want to TELL you which lead to use, but you should find one that fits your style but also your team.
Anyway, as is your team has a few major weakness's.
Zapdos
Salamence
Scizor
Lucario
Gyarados
Heracross
Machamp
Suicune
each one is bulky enough to switch in, take a hit if you decide to not switch and setup or setup as you switch out and pose an immediate threat to your team.
Gliscor covers Zapdos,Lucario WITHOUT ICE PUNCH, Scizor, heracross and Machamp WITHOUT ICE PUNCH.In order to accomplish do this feat you'll need the following set.
Gliscor @ leftovers
252 hp/ 216 Speed/ 40 Special defense
Earthquake
Stone edge/Rockslide
Roost
Swords dance
The special defense EV's ensure that Heatwave and Hidden power grass do under 35% from the standard zapdos set's. Letting you alternate between SD and roost to setup, although you can just as easily Stone edge/rockslide it to death as well.
You also outspeed all non scarf'd/Speed boosted Lucario ( and of course anything slower ) and get the OHKO with Earthquake.
Earthquake also allows you to finish off Tyranitar and Metagross who may be plaguing your team, just watch out for ice punch, explosion and Ice beam.
Now Infernape, while a good pokemon is not fitting your needs at all. Infernape cannot switch into Scizor or Lucario as after they setup, or attack to scout for switch ins Infernape is finished off by Bullet punch or Extreme speed after a swords dance from Lucario. The only way you can counter Lucario with infernape is to give it Mach punch/Vacuum wave or Earthquake, none of which are on your set.
So replace him for gliscor to provide those fighting resists that your team needs in order to help PZ to sweep.
Also If I may break down your team for a second, this is what you have;
Lead
Spiker + Spinner
Scout
Mixed sweeper
Bulky utility
"Star of the show" as people call it.
If the goal is to get Porygon Z to sweep, your goal is to remove Bulky steel and fighting types from play, and then unleash the fury that is PZ.
So a lead + Scout + PZ are necessary, but you also need something to A: Absorb fighting attacks ( gliscor ) B: Backup sweeper if PZ fails that also checks threats to your team ( ??? ) and C: Create a hole or opening for PZ to use to setup and start its rampage ( Bronzong?? )
However Bronzong only has 2 attacks at his disposal, meaning any of the rotom forms/Physical zapdos/Hippowdon/Swampert/metagross and the like can switch in, setup themselves and pose an immediate threat to PZ before you have the chance to setup. Bronzong does have the added bonus of stopping tyranitar for you however, along with Fortress.
The gliscor set I suggested covers some of that, but swampert, the rotom formes and hippowdon ( who usually runs Ice fang for some reason... ) are omnipresent threats that need to also be taken care of in order to get PZ out and about. And thats not even taking into consideration Tyranitar, salamence, Gyarados and Breloom who pose large threats to every team if played right.
So the next switch I'm asking you to make is to get rid of Fortress for Starmie, who helps you check dragons but also acts as a rapid spinner, and unlike fortress it has access to a recovery move and decent special attack.
Try out this set
Starmie @ leftovers
Timid with natural cure
200 hp/ 56 def/252 speed
Recover
Rapid spin
Thunderbolt
Icebeam/Surf/Grassknot
At full hp, with SR in play you have enough hp to take anything from salamence and Gyarados ( if they decide not to setup ) bar Outrage and KO the next turn, and in Gyarados's case even after a DD earthquake/Waterfall/Stone edge all fail to Kill off starmie.
The last move is dependent on what your team needs to counter, grass knot tears apart Swampert, Surf hits ground and fire types and ice beam gets grass and dragon types . You can also switch out Recover and use 2 attacks as well.
So now you have
Lead
Flygon
Gliscor
Starmie
Bronzong
P ZZZZZ
Even with screens up PZ is not going to be surviving any real hits and setting up, so my last suggestion is to switch out Bronzong for a mixed sweeper/Stat upper that can help your team counter the Skarmbliss, Celetran and Joltvire / dos combo's, which will help PZ sweep the rest of your opponents team.
The answer!?
Well your team already covers a lot of it, but play around with my suggestions before making any real changes, and then see what give yous trouble first.