Evening, June. I too, carry in a supertuck and love it. There should be instructions (don't take my Man-Card) in the holster pack for how to fine tune the retention, by "softening" the Kydex using a hair dryer and damp washcloth. Once you soften the Kydex, you should be able to adjust to your liking.
Good luck and enjoy that holster!
".45ACP, because it's just silly to have to shoot something twice." - Anon
"Professionals are predictable, but the world is full of amateurs." - Murphy