Sort of, I'm not sure what will happen in solid zones with mass weighted for a surface report: technically a surface mass is the flow mass, so it gets a little weird.
HTC is based on the reference value, but the value you use will depend on what you're comparing to. You don't need to re-run or run the model on if you change these values. In some cases we use a reference value and the surface reports, in others we output the heat flux and compare that with the experiment: it comes down to what you need the data for.
No worries about images, but please remind your supervisor about the academic T&Cs. Tactfully!
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