Just have to say something regarding corrosive on a huge hardpoint.
Corrosive is NOT wasted on a huge hardpoint. It's a good idea to put it there since corrosive doesn't reduce damage, but instead reduces ammo capacity. This means your huge Multi-Cannon still won't run out of ammo before everything else thanks to its low fire rate. Throwing corrosive on a small hardpoint forces you to replace a thermal weapon with kinetic, AND makes it easier to run out of corrosive ammo.
People are right that corrosive doesnt scale with weapon size, but there are other factors as well.
To reiterate, put corrosive on a larger hardpoint. Slower fire rate means more time before you need to restock that blasted thing.
Just because it doesn't reduce damage doesn't mean it's the best experimental to put on your huge hardpoint. This hardpoint is the highest damage one on on your ship, so it makes sense to put something that increases its damage on it.
Auto-loader, for example, essentially means your huge multi-cannon never has to reload, increasing average DPS.
Incendiary turns your huge multi-cannon into a shield-killer that uses relatively little distributor draw compared to laser equivalents (although it will be a little hot).
Double-Braced makes your multi-cannon more resilient to explosive weapon fire that could disable it rapidly.
Oversized gives a low damage boost if you can afford the extra power draw.
The only time you should use Corrosive on a huge MC is if you don't have any other MCs that are suitable for it. This is not the case with OP, as he has a large Incendiary MC. He could switch the EXP effects on these hardpoints and gain a pretty significant damage boost. Incendiary on a Huge deals more damage than Incendiary on a Large, whereas Corrosive has the same effect no matter what hardpoint it's mounted on.
Running out of ammo on a large, medium or small multi-cannon is not something that should happen in one fight, and you can synthesize ammunition between fights. It doesn't cost that much.
I guess if you wanted to avoid synthesizing ammunition putting Corrosive on the Huge is a good idea, though.