Why not just use a ball valve or low flow jets to reduce your flow, that is unless your pump doesn’t shut off at 70psj ( which should be fine for 1 pole / 3 story)
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I have a Shurflo diaphragm 100psi pump that auto shuts off at 100psi. Never had a need for any flow regulator, last pump lasted 3years of nonstop year-round action
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Excessive back pressure will lead to pump cycling. Most of these pumps are not rated for continuous use, so an accumulator or bypass is a bad idea. Save power, extend the life of your pump, and make your life easier by getting a pump controller.
edit: I just saw that this pump is rated for continuous use. But I still vote for the controller over the other options.