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As others have said, a slimmer gun is going to really help if you have to be tucked in and servicing clients at their business locations. The crossbreed works great. I have carried my colt commander tucked many times and I have never been outed, but it does distort my belt line due to the size of the pistol, and a keen eye could catch it. By "keen eye" I mean CHL holder or police officer, not your average citizen.
If you need deep concealment, a crossbreed with a walther pps, ruger lcp, or similar should be virtually undetectable. They will also be more comfortable than your Glock, and while comfort is not your primary concern, you will be surprised how important it becomes when carrying day in and day out.
I am fortunate enough that I can "carry with a bulge" in my workplace and it is not an issue. An OWB with an untucked shirt or vest, makes carrying a full-sized weapon a whole lot easier, but that does not sound like it will be possible in your situation. Good luck.