(ouch... a lot of text now and my english is not perfect. And if I got the word "Cardioid" wrong, I mean a pick up pattern that most mics are using just in front. Not eight or ball around the mic - the most commond, Cardioid...)
If one of the mics can pick up the sound in an "8-character" you can do a "proper" stereo take (I would probably not hear any diffrence to x-y your mices, but anayway...
) with a technuiqe that was used alot before, because its sounding allright in both mono and stereo.
Put the 8-character so its picking up sound right and left in front of the source. Put the other mic just above (upside down to get it just above, head to head) and it should have a normal pic up pattern (maybe called cardioid?) and pointing to the source. Now you should have the Cardioid (hanging upside down) towards your guitar and "the eight" turned 90 degrees, underneathit.
- Record.
- Make a copy of the 8-character
- Phase reverse this copy in your recprogram.
- Solo the two 8 characters and you should hear nothing, these two in exact same volume.
- Pan one maximum left, the other maximum right.
- Mute off the Cardioid and find the volume spot where you like the stereoimage (if you need to adjust volume of 8-characters, these should always have the same volume)
when it comes to mixing this stereo-recording with the other tracks in the mix i use to make a group channel, of those three, to save alot headache and adjusting.
I really recommend this because its very easy to find the sweet spot between direct intrument and the room, just fading the Cardioid in and out.