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any recommendations for a unloader?

You don't need an unloader unless you're using shutoff guns. With a weep gun you want a balanced pressure regulator. Try the SMC 555 series 2000-2000 PSI range.
 
I prefer the Giant 22911 up to 13gpm up and 1400 psi, if more pressure is needed the then the 22913 up to 3000psi . A little pricier but they work for years and are rebuildable
 
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