No training group near me but I try to attend all the seminars, etc. that I can for the last 10 years.
Have a little experience grappling as well.
Mark made some good points and I've noticed from one class or instructor to the next the work is different.
Systema is supposed to be YOUR system. Just like we develop our own "game" in grappling. So what your seeing is essentially your instructor's system- for lack of a better explanation.
Unlike other styles like BJJ wherein the learning style is more of a mimic this type of deal, Systema teaches concepts versus rote drills like "He throws a haymaker, I close clinch, take to ground, finish."
When I've practiced Systema and I planned out in my mind a mimic type response to an attack, it was always ugly. When I tried to work in the moment it flowed a lot better. I know that sounds like some metaphysical non sense but it's the best I can explain it.
I've taken a lot of the Systema concepts and crossed them over to BJJ. The relaxation and working with selective tension has helped me more than a few times fighting guys 40-60 lbs. bigger.