I am very enjoy listening your performance. Great music, great interpretation.
And because this words of you:
„I've come to realize that all I really ever want to play is South American music...“
we have so much in common. Of course this is not totally true because a time by time I delight with so much different piece from different epochs: Bach, Giuliani, Scarlatti, Albeniz,... (probably like you do).
But South American songs mostly have a melody that easy come in listeners ears, have that romantic melody, unexpected rhythm, special touch etc. Before few months I list pieces of my favorite SA composition. I hope that you have a similar list too.