[Incoherent]

First measurement.

I have NOT compensated for heat shadowing, something that may be quite significant on the 10x10mm setup. The TIM is SX-25, value is a little higher than I expected, although I haven't checked back my data.
I have spent all day calibrating the sensors, from the triple point of water (0.01°C)to boiling point (100°C) and generating Steinhart coeficients for the thermistors.
My variation across that range is <0.1° between sensors, two resolution steps.

Dimensions for those who want to calculate the heat shadowing effect.:

10x10mm

Waterblock surface >> fluxblock sensor, 2.23mm
Fluxblock sensor >> FB bottom surface, 2.00mm
Die top surface >> Die top sensor, 2.00mm
Die top sensor >> die lower sensor, 5.00mm
Dimensions to hole centres.
All sensors are in 1.5mm holes drilled 6.00mm.

Les, you're good.

I'm of to kick my heels up. I will be hurting tomorrow.