Helmet shopping gives me a nightmare now. I have 3 helmets and 1 bike lol. Only the HJC CL17 (which is an older model) has no pressure points. I have a HJC i10 of which the headliners push into the back of my head after an hour or so. I have pressure points on the back of my head on one of the sides. Yes, I did wear it for 20 mins in store before pulling my credit card out. Usually it takes an hour or more to judge. Recently, bought an AGV K1 on a sale, and that also does the same thing. It's a snug fit, maybe too snug. I will return the AGV for a size bigger, but that's not on sale. Have to eat up the loss and try to see if that helps in anyway.
I have been down the rabbit hole trying to see if I could do anything to make the HJC i10 more usable. One of the options was swapping the headliner and pads with a less thicker one. But wouldn't have necessarily worked in my case. The headliners on those have a contour each side, one of which digs into my head. I was looking at swapping the headliner with the older CL17 model, which is when I found the AGV on sale. Well, sh*t.
In your case, I'd say if tightness is the issue - washing the cushions inside might help shrink it a bit. Also, I was told using a roller gently on it a few times work. If there are pressure points, I think it's probably your head shape doesn't match. If you're buying new set of cheek pads, I suppose the lower thickness one would make most sense?
Anyways, all the best. Hope this helps.
End of Rant!