I get what you're saying about trying to be consistent; and multiple sources aren't consistent with each other.  I go by original neighborhood plat maps, street signs, and I spot-check one or two addresses with the USPS.  Usually at least the USPS agrees with the street signs, which also agrees with what is on old paper printed maps, so that's what I generally go with.  In the one case I found recently where the plat map and street signs agreed, but differed from what the post office uses, I put the post office name as an alt_name and I made a note about it.

Often the street signs are incorrect; the problem gets worse as you get further away from the metropolitan area. Rural town and county governments can't hire the best people for making street signs.   There are plenty of signs in Wagoner County where the E and S are transposed or they use "Street" instead of "Avenue" on a north-south road in an area where it's clear they're still trying to follow the Tulsa numbering system.  So I assume what I think they meant even if it's not what they said, and therefore I'm sure I've been guilty of incorrectly changing street names.

Is there anyone else who routinely edits the Tulsa area that you know of? Maybe we could try to have a meeting of all local OSM mappers about this and come to an agreement.  I'd also like to have some agreement among all Tulsa-area mappers about what roads are primary, secondary, tertiary etc. because the existing tagging sometimes seems inconsistent.