ok i'll start, these are one or the other not all at once, buff the pen or other hard stats with a different round in the same gun, add armor above the gun (if really really hull down have some weaker tanks not pen it), slight increase of frontal armor for auto bounce mechanic (to be added to another idea but a watered down version of the other idea), reload speed (on it's own or slightly less but added to another buff), gun handling (my personal preference) make it have better accuracy on the move and a faster aim time, or same aim time and really little dispersion on the move, or very little dispersion on the move and more accuracy, all of these will help it, and since most tanks hit it on the move anyways it only disadvantages tanks that arent paying attention (gives less time to snapshot the cdc if the cdc can snap shot you)
given that the gun used has various aim times and accuracys, on other tanks i think these are the easiest to change stats, and i also think the dispersion could be changed (on the move, traverse, turret rotation, and firing though it won't fire quick enough to have that help it)