I tried for a few months. I think my sound from i,m,a got better after that, but I gave up because I felt "a" finger became short and didn't like the thumb sound. I prefer a more frontal thumb. It is difficult to learn a technique with few references and no teacher nearby.
I don't see reasons for less dynamic or sound control. Sound is a bit different because you attack from the other side of the finger, but overall control of sound or dynamic is pretty much the same. I would think that probably your tremolo improvement was more related to breaking an addicted pattern with the change rather than "Presti's technique" itself.
Here other great players that use the technique:
If one of those or Alice were near here, I would certainly try a few lessons with some of them.