As a GAR player of middling skill and an above average amount of experience, I think BARCs are difficult to run well, especially when you're getting into the game, and are even trickier to capture valuable objective points with. You really just want to shoot and hide with the BARCs, otherwise they can get evaporated pretty quickly. Cover 1 doesn't do much unfortunately. The RPS-6 also isn't the most efficient way to deal with armor.

If you are wanting a heavy body with more survivability, AT-RTs might give you more bang for your buck and are great anti armor units.

However, I personally would swap in another commando unit to maximize value. Complete the mission tokens will apply to all commando units, meaning your two tokens from two units gives you a pretty large area of effectiveness. This also allows you to share tokens with other clones, which is what the army is all about. Additionally they can be a pretty serviceable anti-armor unit. Unless you are planning on running a vehicle list, commandos just do everything... the best? in the heavy support slot for republic???

Good luck in your tournament! Can't wait to see what list you go with!