Audiofeil: I know you're in the business, but you are not going to be able to persuade me to buy one of your expensive protractors :-)
I've used several alignment charts/printouts, and all indicate that my alignment is dead on, as well as overhang.
Feathed: Does your alignment chart provide an arc to help you adjust the overhang? You can try using the cartridge alignment program on this page: http://www.conradhoffman.com/chsw.htm
Those who are in the business to sell expensive protractors/alignment tools may tell you that an alignment chart printed on a piece of paper can, in no way, compare to a professionally made device. I have faith that the printouts I made from that application are accurate. You'll have to obtain the spindle to pivot distance for your tonearm (I got mine from Clearaudio's website). One note, make sure you measure the 20 mm reference distance on the printout for the X and Y axis. You may have to adjust the X/Y "Printer Correction Factor". You can at least give this a shot before choosing to buy anything.