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This looks very promising indeed and stagnation pressure is now where it would be expected to be.
I decided to have a look at the sensitivity of pressure to temperature change for a pressure box.
Using Gay-Lussac's law for a closed container then P2/T2 = P1/T1
Hence P2 = (T2/T1) * P1
Lets assume that the atmos pressure is 101325 Pa and the temperature is 10 C.
Also lets assume that the temperature of the air rises by 0.1 C by the time you take your aero measurements.
The new value for the pressure in the box will be
P2 = ((10.1 +273.15) / (10.0 + 273.15)) * 101325 = 101361
That is a difference in pressure of 36 Pa which is very significant considering the magnitude of the pressure differentials you are trying to measure.
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