I am with EjustE. Ride what you are comfortable with. Personal preferences and riding styles are going to lead riders to stray from conventional sizing rules. I am 6'1" and rode a 59cm bike for 20 plus years. During that period I developed my preferences for seat height and stem height. I developed a preference of having my handlebars 3" to 4" below seat level. This was because I did lots of climbing and liked climbing with my hands on the hoods or the upper portion of the handlebar. I also developed a preference for having less stem exposed. This made for less stem flex during climbing and sprinting.
A couple of years ago I set up this bike. It is 56cm Univega Ultraleggera. I am now a convert to using smaller frames. I love riding this bike.

vjp commented on RFC's bike maybe being too small. I don't see any problem with RFC getting a comfortable fit on that bike. My only problem is with the amount of stem showing. It would be a little to flexy for my preference.
I can however see the sense in the fistful of seatpost rule. If you have to ride with your seat clear down to the top tube you probably have to stand on your tip toes to straddle the top tube.