The pump upgrade will take you from 2200 psi to 2800 psi and will solve your problem. I had the same issues until I had it replaced. They also have a upgrade timer install that stops the drop on initial raise input that is included in the upgrade. I didn't like the way it worked after the timer upgrade so disconnected it. I prefer the slight drop on first raise to the jerky reaction of the timer upgrade.
Check your pump P/N and call Lippert. They should be able to send you the parts to do yourself, or at a dealer. It should be no cost.
Cheers,
Bill
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