"City Pressure Booster Pump" LOL! I wish I had a multi-million dollar marketing division who could make people think it is possible to get a silk purse from a sow's ear. All I have is a pump control that has been working flawlessly for over 30 years, doesn't cost very much, and lasts a long, long time. It is hard to get rich selling something like that. So, my marketing consist of hundreds and hundreds of 5 star reviews from happy customers. The high dollar marketing divisions can make things sound really attractive. "Soft starts, variable speed, constant pressure, saves energy, no pressure tank needed, etc., etc." You end up paying way more for one of those "fancy devices", having lots of problems, and having to replace the pump all too often, which is the main goal of the manufacturer.
The "mushroom" looking device is a pressure reducing valve, which is what is really controlling the pressure to the house, because the fancy variable speed and electronics are not doing the job. When you see one of those you know the pump is not capable of maintaining a constant pressure even though that is what is advertised.
Without a pressure tank there is no water until the pump comes on. I am sure the pump has a soft start, which means it takes a short time for it to get up to speed. When you open a tap the pressure drops and triggers the pump to start. But by the time it gets up to speed you have been out of water for several seconds. These negative/positive pressures are not only annoying, but very hard on water lines and equipment.
A regular jet pump with a PK1A to control it is much less expensive, just as efficient, and will last many times longer. But you won't see any multi-million dollar ad campaigns for the CSV, as it costs so little and last so long you will need to just do a little research to understand it it the best pump control available.
In the mean time, call F&W, tell them about the problem. Make them make it right or give you a refund. It is funny but pump manufacturers really like having problems, because that means you are going to need to purchase another pump soon.
You purchase a regular jet pump with a PK1A and I don't expect to hear from you for at least 30 years.