As I said in my review, you can't rely on the armor. The only way it works is if RNG massively favors you.
Instead, rely on your combination of gun performance, gun depression, and alpha/DPM. Go hull down, poke, and snap shot. Make sure you can trade 2 for 1 with anything with higher alpha, and make sure to just stick to trading with all the 240/250/300/320 alpha tanks.
This is more of a second-line heavy than a frontline brawling heavy. Try not to be the main center of attention, and don't try to tank.
The tank revolves around the gun. The armor is unreliable and the mobility is only decent.