I'm not sure about your +7 and +10, but they sound like familar numbers. You might try searching Google for something like "status immunity site:forums.spiralknights.com", if you haven't already.
Blazebreak's fire protection looks like +3 to me. How do I estimate this? I compare it to a bunch of other armors. Most of them carry +4 status resistance, when they have any at all. Snarbolax armor carries just +3. Blazebreak's bar looks like Snarbolax's.