You might get along better with something like this. The single loop allows the gun float a bit when moving around and in particular sitting but keeps it where you want it.
I just made this for someone for appendix as well, keeps it a little bit firmer but again, the single point allows the gun to move with the body while staying where you want it. I wear one of these at 4pm, really adaptable and solid little holster.
Personally, I'm not an appendix carry person... I get it may be a tad faster and have worked with it extensively, but it's harder to shield the gun while accessing - it's an either draw or no draw proposition. At 4 or 5pm you can use your body to shield getting ready if you are worried about something.
Of course.. everyone works things different and uses different perspectives so that's just what I prefer - not saying anyone is wrong.