Will send images soon. Ran out of spice. No hotspots, burns very even. I noticed that the 7cm long mesh doesn't glow red. Due to the length?

Correct, problem is that the mesh is a bit narrow in width which makes it harder to load without spilling on the RDA, but it won't burn.

My bad. I changed it.

If it's the SS 304 mesh Propello advises TCR 150

You should first configured the correct TCR or the temp will be off. Use TCR 090-110 for SS316 mesh. And a Watt limit of 35W (or up to 60W according to Propello). What happened in your case what the the configured amount of max wat wasnt sufficient to reach the temp which you set. But the temp was probably also off if you used the wrong TCR. Protection means that the device lowers wattage to reach temp, this is normal. After 10 sec it probably auto switches off. This is also normal. 

If you used wattage mode and let it glow red that's fine, the mesh coating clean-up job is now complete. Note that on my last try I used 22W to successfully vape spice. But you need to use inhalation speed to adjust temp (inhale faster if vapor becomes too dense).

Yes. You shouldn't bent sharp corners for these will have more resistance and become hot spots, breaking the temp calculation and making the straight parts (where the spice is on) become less hot.