FWIW - in most states the shoulder is NOT considered to be part of the road.
Personally, I don't make my lane position decisions based on rights, but rather on what's most practical. Usually that means, I'm riding the roadway about 1/3 into the lane.
I do that not to assert any rights, but to be in the sightlines of approaching drivers. Depending on traffic conditions I'll move over as I hear them slowing and if oncoming traffic is heavy I'll squeeze right to create a passing opportunity.
Having thousands of miles in dense traffic, I don't mind very close passes, but I do want the driver to slow down before he tries to squeeze by.
IMO 4' is still too close at 60mph, while 2' is plenty at 20mph.
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Chain-L site
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WARNING, I'm from New York. Thin skinned people should maintain safe distance.