Hey, want the best tip yet for dots on a fretless? Instead of just the usual markers at the traditional fret positions, I made a dot at each fret. Man, it helped my intonation by leaps and bounds. I had Dave Siff try it and he was ecstatic over how it was perfect.
I've always played an unlined fretless. Lined boards always visually fooled me because it wouldn't be long before I was putting my fingers between the lines like they were frets. Since I layed off for so long, my intonation has gotten rather sucky so I made this change and I adapted in about 2 seconds.