Updated Data Columns and Calibration
We found out that the new curve parameters for the calibration based on T_GlassOut fits way better if we use the correct X and Y columns. 
T_Rise is now based on T_GlassOut minus T_ambient.
We plugged in the new calibration formula based on the graph below to calculate P_out as a function of T_rise.
And P_xs (the excess energy calculation is P_out minus P_in.
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Al Potenza, they already said that they would do that (flux meter with opposite placed sensors) at the end of this post:
quantumheat.org/.../...
But, alas, as you said that would still be "one spot" , I think that your omega flux sensor would be better, because it can be moved easily along the casing to measure the flux at many spots.
Here's a thought. Why not measure the temperature inside AND outside the glass at the same spot? The delta T "across" the glass will be directly proportional to heat flow through the glass. You will have made, in effect, a small, single spot heat flux meter. You can calculate the heat flow from the thermal properties of the glass, its thickness and the delta T but it's more accurate to calibrate that small "heat flow meter" with your heater wire and a known power input.
If you do this in several spots, you can also determine the distribution of heat flow out of the cell through the glass envelope and you can get a rough idea about its uniformity. And yes, I know you can also estimate that with IR measurements.
Just a thought..
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