Pinna is the outer ear, which part is it pressing against?
I rotate mine so the part behind the nozzle basically fits against the anti-tragus. The sensor area kinda sits by the anti-helix.
I'm using AE foams, T200 in small. I don't know if the truegrip would be better. Comply does have a listing specifically for the XM3 though.
https://www.complyfoam.com/products/tg-truegrip-pro-for-sony-true-wireless-earphones/
Ah, sorry about that, looks like the google image I used for ear parts wasn't the best.
The microphone/front part pushes on the Tragus, and if I insist on getting it deeper it hurts my tragus.
The back part of the XM3 fits perfectly in the Concha and doesn't really touch the antihelix or antitragus, it just kind of tucks in there after the twist. It still hovers a few mm above the concha and doesn't touch it or rest on it in any way.
I have the spinfit C360 S and M size. They both go in as much and are as solid, but the S lost the seal sometimes, I'm guessing it was too small. The M fits in just as deep but keeps the seal in perfectly. It's just that I feel the bounce, which I think is because it just doesn't really rest on any part of my ear.