Its too powerful for a T3, and slightly underpowered for a t4. Problem is OBM its easy mode. Imo, you have HEAT rounds which increase damage by 25% and pen by 15%. I'd like to see somethign different rather then the same thing for americans. How about 25% reload, 50% increase in turret rotation (it is useful, but not a huge stat boost imo) and 10% damage. That might be too much, but it works.
If thats not what people want, you could always just go with 25% damage 15% pen
OR! We could give ally armor the blitz ability without the penalities since its a T4. 1 free, 4 max, 2 SP with 2 increment. so 2/4/6. That would be super nice imo.
PQ