That's a way
tough call, but I agree with the rest of the comments.
You gave the Miata plenty of time to pass you and get back up to speed.
Did you ask any officials at the track about your concerns after the fact?
BTW...That's a lot of cars on track!
I've been to Miller Motorsports Park a couple times for a HPDE,
but what you're doing there is a bit crowded for this newbie.
Oh...why the few blips on the rev limiter before you shift?
Seems to me your losing some time doing that.