I’ve mostly used the two panopads I bought in December by now, and I’ve liked them a lot. Going to give their panobook a shot next. But I might get back to the pads later for a few reasons.
What I’ve ended on for my layout for them is to put up a vertical line at every 11th dot, leaving me with 5 columns of almost identical width columns (the last one has one to spare).
This setup works well for me, enough space for most tasks on a single line, plus wasting very little room on the page.
Another thing I find myself doing a lot is to just take a ruler and ripping off columns as I’ done with them.