Yes a CSV would keep the pump from cycling and give better pressure to the house. And yes a CSV will work with a galve tank, but there are some considerations. First you need a brass bleeder orifice in the well, not a rubber one. Next cycling is now what charges your tank with air, so when the CSV reduces or eliminates cycling, you may not get enough air charge. Lowering the bleeder orifice will give more air when the pump does cycle, or you can use a compressor instead of the bleeder. You don’t want to run air from the bleeder through a 2” CSV, but all you need is a 1.25” CSV, and they work fine with a bleeder. You won’t “burn up” the pump with a CSV, BECAUSE it has a 5 GPM minimum. That doesn’t mean you can’t use less than 5 GPM. Just that the pump will cycle slowly when you do. You probably don’t smell the H2S because you have a galve tank. Changing out to a bladder tank is probably not a good idea. Since your pump seems to be holding up well, I would just turn up the pressure switch a little for better pressure in the house, manage the sprinklers to reduce cycling, and leave well enough alone. You can always fix these things and add a CSV when the pump has to be replaced.