I've been trying your method for the past 2 days and I've got to say, my putting has dramatically sucked, more than ever before! ;)
On the bright side, I think I've had more lip outs than every before too not to mention tons and tons of near roll byes (1/2 cup or less) on most distance putts. I can see this method being overpowering once I put in some serious hours into it. Finding the different break speeds aiming point and sweet spot is the real challenge. I'm finding it's not as complicated as I initially thought.
Quite a few putts end up with little adjustments, like from 9.7 to 7.2, or half the distance from 10 to 5 (more or less). Likewise, longer putts with an initial aim of 24 might be adjusted to 29 once I see a little more than a constant break. So all puts seem to only need 1/2, 1/4, 3/4 etc., grid adjustments.
Anyways.......nice stuff man. I've been playing congressional and hole number 2 normally leaves you with a 30-45 severe downhill constant break putt. I've been dropping about 1 out of 4 of those putts on a consistent basis with your technique and the ones I'm missing are lipping out or just missing the hole.