Frank's way is pretty close the the peter way. in that i only put the four fingers thru the strap. never the thumb.
because if the pole gets jammed in a crack, and you are moving forward with the thumb in the grip, it's too slow to disconnect (and you are going to crash or break a pole). but if you just have 4 fingers thru the strap, you simply let your arm tail backwards and the pole with auto-disconnect.
it looks that Frank is doing a similar thing, not sure. (looked hard, but could not see clearly)
at least for peter, the ticket is 4 fingers only.
same thing with PacerPoles.
pole length can be fine tuned if that when you are tired on an uphill, if the poles want to splay outwards too easily, consider shortening them in 1/2" steps.
the longer people use poles, it seems they trend to running them on the short side, rather than longer.