I agree with the OP on just about everything, except I would put SC on the LBJ margin map red.
I think it's not an opinion.
So the maps are factual pieces of data and I shouldn't agree or disagree with it 
I'm assuming what the OP did was take the PVI for each state and apply it to a baseline national popular vote equivalent to one of the prior elections. LBJ won by 22.58 percentage points. So if, say, Texas is R+10, then the Democrat will carry Texas by 22.58-10, or 12.58 percentage points.
So you can agree or disagree with using that method, but it doesn't really make a whole lot of sense to cherry pick states unless you're willing to offer your own alternate method to extrapolate results.
OK, but states like South Carolina have elasticity factors. And others factors contribute to certain states, so I guess I'm disagreeing with pure uniform swing, yes.
