I will add another wrinkle, I mostly carry the Airweight Model 12s, K Frames. Not surprisingly, Airweights carry better than Model 10s due to the weight difference (10s are way more enjoyable to shoot). I also have steel K Frames that I use mostly for trainers, but also carry in the same holsters/belts.
The balance on the belt is better with Airweights, less potential flop with the majority of the weight at the center balance point. My experience is the balance point makes a big difference in IWB carry, which is of course variable by each person's anatomy.
The guys at Pistol Forum have been raving about JMCK Kydex for years. I presently trying out a 10 degree cant AIWB at 1300 for a 3" Model 64. So far that seems to work for me. I had always been a straight drop fellow... The 10 degree cant does kick out the butt a bit with my gut padding, but I also have so larger/longer grips that I could swap out. YMMV.