I think for a CHF, CL barrel assembled by PSA; 1-3 moa sounds about right for an AR. If you really wanted to chase precision the obvious choice is a stainless steel, button rifled, untreated barrel is what the best shooters use. While there are som posters on the internet with CHF CL barrels "sub moa" it is the exception and not the rule. There is an absolute reason Wilson, Krieger, Bartlan and Rainer all choose a very similar steel and manufacture process.
Also you should consider upper construction. Is your muzzle device and barrel nut properly torqued? Is the receiver laped for the barrel extension? Is the BCG tight? I don't own a submoa AR in any caliber; but those are the things I would chase.
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