Unfortunately, comfort and concealibility usually don't go together !
Most of your best holsters that do a fantastic job of hiding your CCW are the ones worn inside the waist band -- there goes comfort.
The OWB holsters are the most comfortable, but they don't always hide the weapon as well as the IWB designs.
I use a Milt Sparks IWB ............and my 45 acp dissappears with just a t-shirt pulled over my waist band. Being over weight would cause some problems with this type holster.
Since I don't like snaps and straps on my CCW weapons ............. I would look at the Blackhawk retention holsters ............ see if you find one you like. The retention system is quite clever and once you practice with it ......... it can become second nature. They are sold with a Paddle attachment system as well as a belt secure system in the same package.......so you can experiment a little. Just have to see if they make one for your model yet ??