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My Halcyon STA has 2 tank bands. I put the weight pockets on the lower band. I do really like having 2 bands anyhow, and would recommend it. Both using a STA with 2 bands, and the little pockets designed for the bands.
When diving singles, I also have used weight pockets on the harness waist strap.
If you can significantly reduce the amount of weight on the weight belt, then it won't be so uncomfortable.
I used to have that problem. It wasn't from the weights moving around but the flat out pressure on my hips prior to the dive and after the dive (gearing up, walking to site and back etc). I would have purple bruises for about 5 days after diving. I switched to a weight harness Buy Seasoft seawolf weight harness 201-903 with reviews at scuba.com (this one) and LOVE IT! It is separate from my rig so I don't have all my weight on my rig (lifting a fully weighted rig sucks if you have to do adjustment so I would not advocate adding weight pockets TO the rig. I would go with a harness system which is separate from the rig).
Now I use a DSS backplate with 8lbs of bolt on steel in addition to my harness (https://www.deepseasupply.com/index.php?product=7). Keeps more weight centered over my shoulders instead of all on weight belt pulling my hips down. So I use a harness AND the bolt on plates for cold water diving (36lbs for my buoyant ass with weezle, I envy your warmer water diving).
It is a very bad idea to have significant weight installed on a rig and no way to ditch any of it. The weight pockets are not counted as quick release, especially if she cannot reach them herself (as in on the cambands). XS does make a QR weight pocket, I use them for weight integration on my warm water rig.