Aha yes also completely correct! I found my CL packed in alot more than I expected (I read after the fact that some HJCs are notorious for this). Where it was a good tight fit everywhere when I got it, it's now no longer close to the same after breakin (especially on the cheeks I feel I have more room than I should.) So I was able to size down to a XXL in the RPHA10, and while pretty tight around the head and especially the cheeks (which I was expecting it being "race fit"), I'm fairly confident after breakin it should fit perfect.
On my FG I've noticed the cheek pads have packed in a lot (they were a borderline painful at the beginning), arguably a little more than I would've liked. Top of the head fits fine fortunately