The immediate problem with higher coolant temperatures are the potential loss of coolant over time. 100C is just boiling, and under pressure is a few degrees from actually boiling.

Your oil will run closer to 125-150C when normal, and easily boils off any condensation.

Running 5-10C 'hotter' is not a big deal, and didn't damage the engine. Just keep checking that coolant flow, level, etc. Sounds like you've done exactly the right thing with flush and thermostats. 'Way to DIY!!!

BCingU, Jim