I am not sure but i lean towards making the main gun slower. That makes it still good against fortifications, but reduces it's power against swarms of enemies

Machineguns feel very strong too, but probably good considering they are for AA

Would perhaps increasing the main gun's reload speed or reducing its AA gun's damage be a good Idea?

I would say to give it a counterable weakness, it is just good against everything as is. I don't like the idea of just raising prices and build times, there are nukes and OP super-units galore on workshop

The roller tank is mainly for scout purposes over attack. I wasn't too happy with the support tank either, but it can still be used. The burst tank was the first one to be made, so It may do with improving. The breakthrough tank is very overpowered, and I was actually hoping for someone to comment on it so I could as them what to improve on it. I quite like it at it is, so I think raising its price may be a solution, unless you have another Idea.

Love the flamethrower and ATGM tank, rolling tank feels underwhelming. Idk how i feel about support tank and burst tank. Breakthrough tank definitely feels overpowered