I don't know the musician your referring to, but you should try a new room for recording. My brothers have used their bathrooms for recording and get an interesting sound, and once the landing of a stairs.
by the way,u said u have a tascam fw-1082. ive research those for a possible purchase. it comes with cubase le for mac osx or pc. install cubase and follow the suggestions u got here for mike placement and record with cubase instead of garage band
For mic placement, consider the polar pattern of your mic(s) and then try to place yourself in the room so as to minimize any reflections bouncing off hard surfaces - unless you are going for the effect of the reflections. It can be difficult to record at home due to the small size of the rooms and their resulting reflections. A room with a vaulted ceiling can help.
If you have a portable stand alone recorder you can try to record in other locations. A possiblity - sometimes a local church or school might allow you borrow a large room during off hours.
You should be able to get a pretty realistic recording using your NT5s. Sounds like your room is causing you problems.
Here's a typical situation in home recording... the guitar/player sounds too boomy or edgy-percussive with the mic's close. You try every mic position, every angle and it's not getting you a sound you want. So you move the mic's back hoping to find just the right balance. (And this works perfectly in a good-sounding room.) But you find that the room sound that the mic's pick up more as you move them back is harsh or thin (common in untreated rooms). And you might find too that it's still boomy at certain frequenices that are emphasized by the room.
If you're getting a good sound on the guitar it's easy to record it pretty accurately in a good room, and can be impossible in a bad one unless you're satisfied with an artificially close-mic'd sound.
Treat the room acoustically. Then start experimenting with mic placement all over again. Everything will sound different than before. Even just gobos made with Owens-Corning 703 help a lot.
Even one 4" thick OC703 panel behind the mic(s) can make a difference if you are close miking...
Here's a couple very quick samples I recorded of Mono vs Stereo and how (I think, anyway) a stereo recording gives a much more "natural" sound...where mono kind of sounds "boxy" or like the guitar doesn't have enough room to breathe...