Yes I tried the fit app. It frequently said they fit perfectly. I’d sit still for a minute or two and do it again. Then it’d say to adjust or change the tips. I tried all the tips. Many times each. It just wouldn’t stay put in my ears.
Like I said though, I think my ears are particularly weird.
What works for most doesn’t work for everyone 
No worries of sweat for those CIEM?
You ever try something like this?
Gets rave reviews from athletes for keeping them in during exercise… ordered a set for mine!
The problem with these is you have to remove them to fit the case, which is also the charger. PITA, but so far I don’t have a solution. Also, even with the largge gaskets, I don’t get a good seal. What is needed (for me) is an XL pair of “gaskets”, but no luck finding.
I have been a huge AirPods Pro fan but want to share an issue and see if anyone else has experienced it. The noise cancelling is just phenomenal. My wife, daughter, and I all love them for day to day music and movie usage. But…I have now had to replace 2 different earpieces. Apple support has been superb and has replaced them both, but it’s been the exact same issue both times. Crackling develops in an ear. It’s especially bad when riding on the trainer with the fan blowing in your face. It starts small, but soon becomes a constant crackling. Interestingly, if you turn the noise canceling completely off (not in “transparency” mode, but “OFF” mode), it goes away completely. I have to think it has to do with the fan or sweat.
Anyone else had this issue? If so, did you just keep replacing pieces, or switch to something else?
I haven’t had this issue (been using for about 5 months now). Good to hear that Apple replaced for you.