Outside of the gas port errosion, every one of those scenarios comes down to "it depends". The 11.5 will probably have more gas port wear due to higher port pressures.
Gas port size, ammo used, and can use are all going to change the equation. However, all being equal, the two are going to be pretty close for gas blow back and carbon. Outside of laboratory testing, i don't know if you could really see a meaningful difference.
I can say though that my duty 11.5 DD with a Huxwrx can has significantly less gas bow back and carbon than my 16 inch midlength with my YHM traditional design can.
C co 1/30th Infantry Regiment
3rd Brigade 3rd Infantry Division
2002-2006
OIF 1 and 3
IraqGunz:
No dude is going to get shot in the chest at 300 yards and look down and say "What is that, a 3 MOA group?"
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