I like to ride at 70-80 psi, but sometimes ride at 60. According to your chart, that works for my rear tire, but my front is overinflated. Rivendell has been promoting wider tires at lower pressures for years. In general I've found that to be good advice for me. Wider tires at lower pressures roll really nice. I run 1.5" tires on both of my bents and have no intentions of going any narrower.

One popular bent tire is the Schwalbe Big Apple, available in 2" and 2.35" versions. Those usually are run at 40-50 psi and they roll very nice at those pressures.