Is your holster located in the sweet spot for your draw to be at its best? When you put your duty belt on, the location of your pistol should be your primary concern, since it is the most important piece of equipment on your belt. A shift of an inch or two in the location of your holster can result in a grip that is higher or lower on the back strap than you want.
If you are not sure where your sweet spot is, here is a tip: Close your eyes and, with no duty belt on, reach 10 times to where you would grip your pistol. On the tenth time, look to see where your hand is. This is your natural draw position.