Here's a suggestion that may have been touched on elsewhere, but I didn't notice in this thread...
What I do is drag the target past and before the hole before committing to a distance for my stroke. Most often, on long putts, the distance will show in the target box in feet without a decimal point. If, when you drag the target towards the hole, it shows "14ft", for instance, as the target triangle first touches the front lip of the cup, then the putt distance is truely 14ft. If the target box shows "14ft." before the target triangle reaches the cup, the distance of the putt is actually greater than what is shown in the target box. Sometimes, I have found the distance to be almost a foot longer than what is indicated. This should allow you to more correctly judge the distance of your putts, making for less under-stroked putts, as well as less errant putts hit well past the cup.
To take this technique a bit farther, while dragging the indicator, take notice of the "^ & v" indicators. I use these to determine where "breaks" are liable to appear in the ball's path to the cup. I've found this to be vital information especially around the cup, where there may be a rise or drop-off that might cause the ball to slow (before) or tail-off (after, if the putt is missed). Using these strategies has helped my lag putts result in many more tap-ins, and sometimes results in long birdies that previously were unrealistically difficult. I now make 12-16ft putts regularly, and frequently drain 20-30 footers!
Of course, it helps if you are consistently able to hit the "ding line" (center-line) on the swing meter, too. LOL! I'm sure this may be "old news" to players who've been around for awhile, but it may help some of you new "hackers" - especially those of you who've had some putts end-up being short of the cup. One other thing to remember, as has been mentioned numerous times - putt "through the cup"... Don't be afraid to add a little more stroke than what you feel is sufficient to "get it there"! I routinely add about a foott to my "level" putts, and about .5 foot to the downhill ones after calculating the distance that will get it to the cup.
Also, If the indicator reads "^ 0", there could be as much as .5 inch rise... "v 0" there could be .5 inch drop.
On long putts, there can be, and usually is, alot of different ^'s and/or v"s on the ball's path to the cup, so if you want to drain more of them, or at least get them close more consistently, don't just move the target box left or right at the hole and hope the ball will get there. Quickly "read" the green along the putt's path, and lower those scores!
Hope this helps! :)