Sounds like you have some very good skills. Do you play with calluses or nails? I play with calluses and keep my nails shorter than the end of my fingers.
Actually it varies.... I keep my nails about 1/8-3/16" longer than the tips of my fingers so I can get the "claws out" for a more aggressive sound but relax the fingers for using the "fleshy parts" and a more muted tone. I still palm mute and do the other little things to modulate as if I had a pick in use, but getting good volume can at times be an issue without some kind of amplification. I have installed K&K Mini pickups in a couple of steel strung guitars with good results, and should consider sticking a set in a nylon strung instrument just to see if that is a good option (although I can't see why it wouldn't be as they are not magnetic).
As for the "skills"? That's a work in progress, and I really do envy you for having the experience and training to master your chosen instrument and genre. Like many of us I was seduced by the "dark side" and drawn off course by the "evils of Rock & Roll" spawned by Elvis, the Beatles and the rest of what has become called the British Invasion along with sand, surf, and that whole Southern California music scene I grew up in. (not that there's anything wrong with that...)
"what is this quintessence of dust?" - Shakespeare