Indeed this question has been covered a lot. It doesn't make it irrelevant though.
Some experiences of mine are:
1) Keep it simple and play well...
2) If you are closer to the guitar than 35 cm you are in a very complicated zone. The sound may vary a lot and you may get unwanted boominess.
Watch this for a simple reference:
3) The separation between the mics has a huge influence too. Watch this:
After hundreds of hours of experimentation I have come to this simple set up:
Small diaphragm mics angled 60 degrees with the capsules 17 cm apart.
This gives a nice stereo separation (wider than your NT4s but not huge - a classical guitar is a solo instrument, not an orchestra).
It has very few phase problems (turns into mono well).
I place the mics about 60 cm from the guitar pointing 45 degrees down.
The 60 cm distance does add a little natural ambience to the recording, but not too much (if you have a very nice sounding room increase the distance).
The downward angling of the mics makes the sound a little more mellow and full instead of direct and sharp.
4) Microphones are important - if you already play well on a nice instrument in a nice room...
I had several mics before I bought a pair of Neumann KM184. They are completely loyal to me. If the recording sounds horrible it's not the mics but me, the room or whatever.
I never had a success with LDCs but thats my preference.
There's not such a thing as the best mic but you don't get professional results with very cheap mics. The good news is that it's possible to get very nice mics at a very reasonable price. I guess your Rode is in this category.
5) Experimentation matters a lot as your location and wishes may vary a lot form other players.
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