Thanks Marty! Your project has me intrigued. Where are you pullin' the readings from? Are you using old-fashioned piezoelectric strain guages or some kind of strobe set-up.
I remember from working with turbines some setups we would use photodisplacement cells to measure torque on high-speed totating shafts. Another method would use a scribe line paralell with the shaft and we would use a diode(kind of like a timing strobe) to measure when the line would pass by the receptor. Naturally, it the shaft was torqued one end of the line would pass by sooned than the other side. By measuring the time difference and knowing the rpms you could determine torsional displacement.
This all sounds really Cool! Good Luck!