I know, and unfortunately, I'm still having trouble with a good number of those single pilot missions too. I've got them all regular S'd, but the gold SS seems to illude me. I've had some luck with using the Macross + Misa skill, and having 3 backups use Glabil. The upside to that combo, is that all the Glabil's have barrier shields, & spiritia beams. The Spiritia beam if it connects will stop a target in its tracks, making it an easy target & stopping it from attacking you while affected. The downside to using any backup is that if they tke damage it lowers your score.
As for the Macross, its got a quicker recovery time from its Macrsos Cannon special than Battle Frontier, and if you use the Misa skill before the cannon, it'll do a ton of damage, and if you're lucky kill the target if you were able to hit it with enough missiles first.
A good trick with Bodolza, is to use all Gigil's mecha as your backups, since you can only damage him in the face, and they'll freeze him almost all of the time. if only all of levels were that easy.