My Summer, Winter, etc. pistol for now is a Ruger SR9 or CZ83. It will be my Smith M&P c9 as soon as my holster arrives. I know, by way of experience, how challenging it can be to find "the one" pistol or revolver that works well in warm/HOT weather. And I did try a whole lot more weapons than I care to admit to. The Smith just works well for me, my lifestyle, and my dress style. Mostly jeans and t-shirts or work shirts. By the way. And in the years that I have had my CHL and have been carrying, I've yet to have a major problem.
So, as others have suggested, try as many different brands and models you can. Everything and anything. The 1911 5" a friend of mine carries is a perfect fit for him, but, not me. Neither is the XD 3" another friend carries a good fit for me. Yet it fits him perfectly. And yet once again, another friend will only carry a Sig 226 5". Because that is what he carried on and off duty when he was a Trooper. And yes he did/does carry a bug.