Vertical matching is the way to go, I agree. when your going from 4:3 to 16:9 for example the only difference is peripheral, not turning mechanics, vertical FOV eliminates some of the problems that this presented.
When I previously posted the formula of Chord Ratio / Circle Ratio (which equals extremely close to 100% monitor match) it seemed that something was not correct, I expected different results, put it on the back seat and looked for another solution.
Using Vertical FOV in the formula gives the results I was looking for, in a similar way that original view speed does. I'm testing this method currently with Drimzi and so far I really like it.