Wrote and installed the code for running the ring heaters.
Added the rough calibration values that Aidan B had recommended for running the ring heaters.

Some data below:
Upper:
Requested Power = 1.00 Watts
Requested Current = .17 Amps
Measured Voltage = 6.85 Volts
Measured Current = 0.16 Amps 
Calculated Power = 1.13 Watts
Calculated Resistance = 42.81 Ohms

Lower:
Requested Power = 1.00 Watts
Requested Current = 0.17 Amps
Measured Voltage = 6.71 Volts
Measured Current = 0.17 Amps 
Calculated Power = 1.11 Watts
Calculated Resistance = 39.47 Ohms

A quick, back-of-the-envelope calculation shows that the ring heaters are working properly. Although their values are a bit different than ITMY shown in ALOG 8816, this is mostly due to only being roughly calibrated.  The next step is to do a long term 4+ hour test to show curvature change and robustness.