Is the pump turning on and off? Remember there is a pressure switch on the pump and if the shower fixture has a water saver or any restriction then the pump will pump the system up to the cutoff pressure, turn off, and then once the pressure drops low enough the pump will come on again. This would be perceived as pulsing at the shower.
To me that sounds normal, if you don't like it you could alter the shower head so it runs continuously.
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