I would agree! I have swapped in my double-dome S/M with a L size many times over the months I’ve been wearing my Phonak Audeo B-Direct aids. Yes, the sound quality is a sliver different, but I make the change for comfort.
My left ear swells on a regular basis, due to exercise, humidity or even having just gotten up in the morning. While I’ve worn the size L dome on my RIGHT aid with no probs ever, I have to keep monkeying around with the LEFT aid.
When I get leaky-squeaky stuff going on (most noticeable during NON-streamed phone calls) I need a larger dome on that side. If that ear canal swells up tho, it gets red & painful jamming the L dome into the ear canal. I only developed this problem in the past few years.
Oh well. Old age SUCKS. And if this is the extent of my discomfort, I am very lucky. 