Another thing; the Type 89 Yi-Go has AP ammo but against the FT-17's and the Crossley A/C's I've encountered it only fires HE. I had to go up really close to be able to take the Crossley's out. Any explaination for this?
From memory it only has an AP shell with 2 or 3 penetration so at range HE is more effective at penetrating. Your tank crews are using the right shell for the job. If the gun is short ranged (cant remember) the AP penetration will fall of quickly at range.