I would check the flow from the pump at the well head. At 50’ that pump should deliver 16 GPM from a wide open pipe. Even if the well won’t make 16 GPM, the pump should still start out at 16 GPM, or iron maybe clogging the impellers.
If the pump is OK and the well will produce 11 GPM, that pump should make 11 GPM at 50 PSI. If it doesn’t, then the micronizer or the pipe after the micrinizer is your restriction.
You can use a CSV on the well. After the pump is running, the constant pressure will make the flow dependant on the amount being used. So if you are only using 2 or 3 GPM, the pump is only producing 2 or 3 GPM, which is not enough to make the micronizer work. Setting the CSV at 45 PSI while using a 30/50 pressure switch means the micronizer will work until the tank is ¾ full at 45 PSI, which is usually enough air to make the system work. Then the CSV will let the micronizer continue to work as long as you are using more than 5 GPM.
Pumping from a non-pressurized storage tank is the best way to use a booster pump. Hook the well pump to a float switch in the storage tank. The well pump will keep the storage tank full of aerated, treated, and filtered water. Then a booster pump can draw as much water as you need from the storage tank, and deliver it at the pressure you want. In this way you can actually use a lot more GPM in the house than the well can produce, for short periods of time, depending on the size of storage tank. You can use a jet pump or a submersible from the storage tank as a booster. The submersible will be much more quite and give more GPM per horse power. You can use a CSV on either type pump, which will give you constant pressure and allow the booster pump to work with a very small (4.4 gallon) pressure tank.