Defense Up Needs to be Revamped

The way armour works in this game, IIRC, is as follows:

Damage Reduction % = (Armour) / (Armour + Level x 10) x 100

For instance, let's use CT5555 as an example:

lvl 1, gearless 3 star: Damage Reduction % = (4) / (4 + 1 x 10) x 100 = 28.57%

lvl 70 maxed out: Damage Reduction % = (292) / (292 + 70 x 10) x100 = 29.44%

As one can obviously observe from this, a maxed out character, even for one of the toughest tanks in this game, has pitiful armour, with damage reduction % not significantly better than his freshly unlocked self.

All this in an environment where damage balloons with increasing level.

Let's compare defense up vs. no defense up for a given damage, say, 4000:

No Defense Up Damage = 4000 x (1 - ((292) / (292 + 70 x 10))) = 2882

Defense Up Damage = 4000 x (1 - ((292 x 1.5) / (292 x 1.5 + 70 x 10))) = 2460

Doesn't take a math whiz to see how this is a sick joke.

Now let's do the same comparison, but with offense up giving us 4000 x 1.5 = 6000 damage:

No Defense Up Damage = 6000 x (1 - ((292) / (292 + 70 x 10))) = 29= 4234

Defense Up Damage = 6000 x (1 - ((292 x 1.5) / (292 x 1.5 + 70 x 10))) = 3690

If anyone can look at these numbers and say: "Yep, the current defense up buff works just fine"...