My maxHR estimate might be a bit too low.
Quite a few years ago I did a few maxHR attempts during spinning bike classes. I managed to get to 200 after several build-ups. I'm sure I didn't get my actual max as I wasn't fit enough. I figured my maxHR for running is higher as it's a lot more difficult for me, so I had it at 210 for a couple of years, and then lowered it to 205 at a certain time.
Not having run for several months I started about 3 weeks again. Today I felt extremely restless, and ran a lot faster than I should have at my current level of fitness. And ran about 4-5 minutes above 90% of this 205bpm. Guess it's time to set it a bit higher? (note: I'll never be able to do a proper maxHR test for running due to dysautonomia triggered by running, and no spinning class available).