Well, a lot depends on your physical characteristics for one,,,then there's the way you dress. If it seems you can't find the perfect spot for IWB carry, then maybe you'll need to try different holsters. I need a good cant when I carry IWB. When I carry OWB, it could be canted or straight drop depending entirely on WHAT I'm carrying. The larger/longer grips disappear on me with cant. The sub-compacts doesn't matter to me for obvious reasons....the shorter grip. Now....certain holsters go with me when I tuck my shirt in.....others go very nicely for an un-tucked shirt and I'm even better off (more modular) with something more bulky like a pull over sweater. I do kydex and leather holsters with the same good results. I mainly carry at 3 o'clock IWB and the OWB could be there and back to 4-4:30. I have also carried IWB exposed.
If you can't find the sweet spot with your holster, then I would say you're either not dedicating enough time for any certain position, or your holster/carry combo is not actually comfortable where you want it to be. Everybody is different. For some it's easy, for some it's work. I know me, and I'll usually be able to choose what will work best for me by simply looking at a holster. I've had a few that didn't work out. There are so many variables for holster/carry/body/dress, I wouldn't even be able to guess at a number, and I took probability and statistics for a fun class in high school.
My honest opinion? Try another holster. Good holsters are listed here in the buy/sell/trade forum regularly and discount prices. Heck....I just missed out on a Don Hume 721OT holster for $20 simply because I wasn't here at the right time (still pouting about it too). My daily carry is a G23 now...same as your G19. I'm 6'1" and 200lbs. I have minimalist very functional holsters like the Galco SkyOps, and I have larger holsters like the DeSantis Scorpion for IWB and a lot in between. If you want to cover just about anything you do, or anywhere you'll go, there will definitely be more holsters in your future. Just remember there are a lot more folks out there going through their trials and errors as well, so if you get something at a decent price that won't work, you should be able to turn around and sell it for someone else' test run. Good luck with it all.