Thanks again for this technique man ;). Not to toot my own chain, I'm tooting the JC Chain!!, but I used your technique in the current Masters Congressional and Marion tournament and so far am sitting in 1st place (both). So imho there is some very serious merit in your technique. Although, for double breaking or just strange putts Tekoma's Vertex putting hits the spot.
In regards to putting the aiming triangle on the right spot I'd suggest using JRuler, a visual, click and drag ruler with Pixels, Inches, Picas, and centimeters available. I use the JRuler in Centimeters, 50 Pixels per inch and then zoom in 1 time in the reverse putt view.
I find that usually gets me between 9 1/2 - 11 1/2 centimeters on the ruler. So you simply find out where the 10 foot mark is, divide the number by 10 and then use the ruler to move the necessary length. I.e., 10 foot mark with JRuler ends up being 11 centimeters. 11 / 10 gives 1.1 centimeters. Take your 8 foot break (adjusted for say 1/2 break) gives you a 4 foot aiming point. 4 X 1.1 = 4.4 centimeters aiming point.