A CSV will work with any size tank. No stagnant water issues. However, you have a “bladderless” tank. So hopefully you have an air charge system (bleeder orifice) down the hole to add air to the tank each time the pump starts??
The pump NEEDS to cycle on and off to put air in the tank. You can put the bleeder deeper in the well so it would add more air each start, because with a CSV there are many less starts, but you are probably better off without a CSV on an air charge type system.
If you have sulfur, iron, or something in the water, adding the air is the best remedy, which is probably why they still use that old type “air charge” system in your area.
If you don’t have smelly stuff in the water you would be better off with a bladder tank and no air charge system.
You should not need any kind of filter or sand trap for sand or sediment. A properly constructed well should be it’s own filter. That is what the 30’ of screen with the .008 slots are for. I would pump it hard until it stops making sand, and if it doesn’t stop making sand, call the driller back.