The theory of why things are where they are makes sense, but you may look into some other ways to approach your issues.
If the belt shifting is an issue, you may consider a double belt system that utilizes velcro to attach an outer belt to an inner belt worn on the pants. The Biancchi duty belt can do that on it's own. If you want the velcro belt, but with padding, there are only a few out there I know of (Velocity OUB, Snake Eater?).
Another way to solve an issue with weight distribution in to remove excess weight. Low hanging fruit here is the 3lb knife, 1-2 pistol magazines, and the extra GP pouches. Stow the multitool and flashlight in individual pouches and you'll save weight on nylon alone.
I don't know what climate you train in, but there's a lot of potential chafing spots on that setup depending on heat/humidity, specifically, under each leg strap and all along the padded belt.
There's a thread on the forum called "warbelt setups" that's worth looking at. You'll see some trends there that are worth adopting.