The seal test is basic to the extreme.
Try foam tips in that case - they'll change the character of the sound as well and they will need to be replaced far more frequently than silicone, but will result in a more secure fit.
Comply are a reliable source. Some people are saying they fall apart eventually, but people seem to be that idiotic and unable to understand that foam tips are consumables, because... well, foam, not silicone.
Comply Foam ear tips for AirPods Pro and AirPods Pro Generation 2. These AirPod Pro ear tips are designed to deliver an elevated listening experience, with a snug and secure fit and the capability to block unwanted noise. As audiophiles ourselves, we understand the importance of exceptional ear...
www.complyfoam.com