The biggest thing is that a Soviet player going T1 means you need to go Mechanized Regiment rather than battlegroup. You also had some issues with unit management.
Are we using the same panthers? I always have to micro panthers carefully because if you aren't careful 4 Jackson shots will end one, and a T34 with two Zis guns or two T34s with one Zis gun can easily take them out.
Try playing as OKW and doing the same thing if you think Panthers are a giant I-Win buttom.