I store all my Sheridans, unlocked, with 2 pumps in them. Sometimes a Sheridan has some wear & has to be cocked before it pumps up any pressure . In such a case, I would cock it first, then 2 pumps. All are stored unloaded . When getting ready to use those , cock, & dry fire in a safe direction.
Your rifle was overhauled & set to shoot at maximum fps. It was the hardest shooting one I had in a long time. I have a few others that require cocking first, too. That is not a bad thing. After some use, you may not have to cock it first. It does not hurt it either way.
I store mine with 4 pumps in it, not cocked but if that was necessary I'd cock it pump it then dekock by holding the bolt pulling the trigger and slowly letting it close.
What David said is what I do. But only 2 pumps.