Air Venturi Avenger Lowering Regulator Pressure

Hi. When adjusting (lowering, my goal is to start at 1400 psi) the regulator pressure setting, I understand the air tank needs to be emptied. When filling, the product manual indicates filling to 4500 psi, however I don’t have that level of air pressure currently available. Is close to 3000 psi sufficient? Is the key to fill above the regulator set pressure? Thank you.
 
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