I have a squared off Desantis "Nemisis" for my pistol and the backstrap sticks out about 1/4" of my Carharts back pocket. I am very consious about conceling garments covering the little bit exposed.
A rounded holster would allow it to roll and sit slightly lower. I plan on getting a Mika rounded holster when I get tired of my Nemisis. The draw would still be close enough, hooking the thumb under the grip.