That's the best carry gun imo. I have a 42, a 43X MOS, a 19, and this C2. The 19 is so much more carryable than the C2. You can do all the length and width measurements but somehow it just doesn't equate. Compared to a 19 the C2 is a big bitch. It's dry weight is 8 oz heavier. Everyone is like, "It shoots so well". Ya, because it's a heavy bitch. Not bad OWB but not optimum IWB and straight up painful AIWB like all the Instagram and Reddit "bois" like to carry
Don't know to what the reference of Instagram or Reddit Bois refers...
To describe AIWB as painful, you're running the wrong holsters and/or accessories, AIWB should really make carrying a bigger gun easier.
I carry a Wilson Combat 320 Carry, I've carried with my two AIWB systems while dry-fire practicing in my house in pajama bottoms, which is about as bad a way to carry a gun as can be, works fine... Sweatpants, gym shorts, dress pants, shirt tucked in, whatever... they've been excellent.
Belt or no belt as well, doesn't matter, my Tier One Aegis Elite has the UltiClips and the Enigma system is its own belt, you can literally wear that thing and walk around naked if you're feeling frisky.
I've found those to work so well I actually carry with the 21 round mags, and that C2 is about the exact same weight, magazine size aside.
I'm 6'1 176lbs so it isn't like I've got an extra innertube protecting me either.
It's possible you've just got the wrong body type, but I think it's far more probable you've got a holster issue.