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To be honest USF pop cap abuse is never a factor in 1v1s unless the match has already been determined for quite some time. I can see for 3v3 and 4v4 but never for 1s. I always need my vehicles and tanks not just sitting around doing nothing.
Scotts aren't that helpful to be honest. Even in pairs their more of a RNG machine and personally I'd make the barrage have a quicker cool down in exchange for less than effective auto fire.
Jackson should have the same HP as M10 and be faster and/or maneuverable then other medium tanks to really be a quick, hard hitting but fragile tank destroyer. By the way it already does do 200 damage and has 200 penetration which isn't bad by any stretch. Combine it with HVAP and vet 3 it basically has 100% to pen a Panther.