Here's something to consider, smoore. (I can tell you're a thinker from your posts.) I recently bought a new 640 Pro. I love it. I shoot it better than the 642-1 I've have had for many years. And anytime I could OWB belt carry, I started carrying the 640 Pro (in place of pocket carrying my Bodyguard). I have a regular gunbelt, from Hanks, and my OWB holster of choice is a DeSantis thumb break scabbard, worn in the high ride loops. It conceals easily as long as I'm wearing a shirt that is untucked. Anyway....I recently got the 642 out and wore it in the holster, and I'm surprised at how much better it feels. I would have figured roughly 22 ounces for the 640, and roughly 15 ounces for the 642, what difference would that make on my belt? Well, to me, it's quite noticeable. For now, I've gone back to carrying the 642 quite often.
I'm not small. I'm 6'2", 195 pounds, and I've been working out steadily for over 40 years, so I'm not feeble. So the 640 Pro is far from "too heavy". But the 642 feels better. Which has me thinking about a 340PD.
Non-LEO's who carry a large or heavy gun all day must be really committed. I'm not ashamed to admit I prefer to stick with light weight. I can handle the heavier recoil as the price to be paid. I've never felt the need to carrying lots of rounds. If I did, I'd carry my Hi Power.
Good luck with your decision.