Acoustic roots music with good microphones such as what you already have, shouldn't require any compression or equalization. Of course if you are singing and playing simultaneously, together, it's all part of the sound. You could record one at a time and your problem would be solved. I have made plenty of recordings with just guitar and vocal, a little reverb, very little compression, direct out from the acoustic also with a pair of SM 58's also on the guitar. The vocalist is singing into a Beta 58. Perfectly lovely sounding. You've got nice microphones so what's up with that? What do you think you're missing? Have you engaged the low cut filter for the vocalist? Have you also tried the direct out from the guitar? Have you tried the direct out with a microphone on the guitar? What kind of sound are you looking for? Perhaps the problem is in your monitoring system? Maybe your headphones? You have all the elements in which to make a good recording.
Sorry I'm no help?
Mx. Remy Ann David