I mean no offence to anyone here, when I say that: when a 'good gunbelt' is necessary (usually defined as thick and stiff) then either the pistol is too big and heavy, or the holster has been designed/chosen poorly (carries the pistol so that the set is top-heavy).
Certainly I would expect some other holster makers to be offended because there are those who don't pay attention to ideal ride height or ideal carry angle, or to 'twist'. What is the (true) saying, "those who can, do; those who know, teach"? At some point a maker has to be willing to walk away from a design, or a size within a design, if physics aren't on our side.
I've a design right now, that my armourer feels 'muzzles' him during carry, yet it doesn't muzzle me. Puzzling, but it won't be produced until he is satisfied. Not me, him; he's the gunfighter, it's his life on the line not mine.