The thing I discovered is that, for me, a 4" is just as easy to conceal as a 2", and much easier to shoot. This may not apply to everyone, just my opinion.
you sir just cost me $75 at payday glad its 2 weeks away so i have time to decide which set i want in my 640 pro+1 for point shooting. Do it at home with an empty cylinder and dry fire while you do it. Repeated dry firing (with snap caps if you prefer) will smooth out the action.
Pocket carry is good, the cylinder width can print but they truly disappear into the right IWB holster.
Although I don't own one, I've shot one a handful of times and I have to say that if you get a S&W J-Frame, VZ grips make a hell of a difference: https://vzgrips.com/gun-grips/s-w-j-frame