“The Well-X1 can also be set at a narrow pressure differential, allowing it to provide constant pressure with any new or existing pump.” Amtrol
They do recommend a narrow pressure differential (10 PSI). They think cycling on and off with 10 PSI differential is “constant pressure”, as compared to cycling on and off with 20 PSI differential. However, cycling on and off with a narrow differential is not “constant pressure”, it is just less of a pressure swing than with a wide differential.
If you want REAL constant pressure, and you want to stop blowing start capacitors, burning up motors and everything else, you can add a CSV to the plumbing before the WellX1. Then you can use 10 PSI differential and have REAL constant pressure when using water in the house.
Although it would work fine with the 44 gallon tank, a CSV would only need a 4.5 gallon tank (like the one pictured to the left). Which is exactly the reason Amtrol doesn’t sell CSV’s, because it drastically cuts tank sales. The CSV with any size tank, even 4.5 gallon size, works better than the WellX1 and a big tank.
I have a lot of spare control boxes that are more than 30 years old. I would not be afraid to hook one up if needed. Of course these were made before the government started regulating out dependable and long lasting products. Now they mandate a small efficiency increase that makes everything more expensive and much less dependable.
Your pressure bottomed out because refilling the system took more water than the pump can produce. It is the amount of water you are using that determines the pressure the pump can deliver.