I have the same problem. Boldoza fires way too many missiles, and that stage is way too long to keep trying, Im pretty much done with that sheet. Same goes for the A-7, I kick the crap out milia with no damage, but taking out that ship is a pain. But, I'm happy with Hikaru's 1s, I dont need Roys anyway.
a-8 stick close to bodolza's head to prevent the missiles from hitting you, then just attack using your bazzoka first then move to head lasers+gunpod while moving in a clockwise direction
a-7 to beat the ship, get in a perfect center position then go into gerwalk mode as far from the ship's missile range, yet close enough to launch your regular missiles (large missiles tend to explode when they get hit) time is the key in this stage, the quicker you kick millia, the better the chances of netting an s