I agree that the 16x20 pattern in this frame seems very tight, probably even more than an 18x20 in a MP sized frame. With syn gut at 60 lb., that makes for a rough time on the arm. I've used syn gut in the mid-40's in this frame and it felt pretty good.
I really wonder why people are so afraid of going with low tensions. The power level doesn't really even increase all that much, to be honest. And this frame has so much control with low power to begin with, it really needs some added pop from a lively stringbed.
Lois: "Peter, I'm not wearing any panties."
Peter: "That's ok, honey. We can throw that chair out."