With tank combat, a major factor is armor itself. Keep all four sides safe and whatnot. My suggestion is to make this skill a little less pro only. Any damage you take, the armor next to the armor that gets hit takes 10% of the damage. Pro's Makes tanking a little less bizarre with how armor gets damage. Con's Not needed Alternative Idea Make tanks look like they take damage then this isn't needed.
Lol yeah because 10% of HE damage is going to be game breaking compared to 10% of the other cannons damage? lol. I think the suggestion is good. Implement naow.