Unfortunately, I'm not sure we can do much in the way of balancing teams. Team stacks do happen, and it can't be helped. However, ganein has provided some good advice. Interim Apex has loads to offer, and the best way to find the proper counters in the various situations is literally what you're doing now. Try everything, approach with every possible attack, place yourself in the enemy's mind. The last one is especially important for a game that has this much content. The next time you find yourself on the other team, try out their vehicles and units and see what kicks your ass there. Take that new knowledge and bring that back to the other team the next round. Before you know it, you'll have a better idea of what counters what, and what units are the right ones to bring out and which ones are the wrong ones.
But yeah, I don't know you. You are also right in that it doesn't matter. All I know is you're another player and it's great to see a fresh face. Welcome to our community, Mycroft!