Yeah thanks for the heads-up on the --mode thing, FITNR. Probably wouldn't have noticed it if you hadn't told me, but as soon as you explained the behavior, I knew it was the no_argument thing.

The offset thing... Yeah it's in microseconds. I changed the default at some point during testing because I was getting more accurate results. I will change the readme to reflect the fact that it's actually in microseconds. If you change it to like 5000000 you should definitely notice a difference.