I just got a Bianchi with the retention strap for my M&P compact, and I must say it's the first leather holster I've gotten where the gun fits in the holster when I first get it. However, after playing with it for a bit yesterday (first day I got it), I notice that sometimes my draw is smooth, and other times the holster wants to come with the gun (strap is still there, but unbuckled in both cases). Is this a problem with breaking in the holster, or with the way I'm drawing?