Hi Doc, I will try and answer a few things.
Doctahpaul: Forgiveness with a club-what exactly is it?
From the FAQ -
Precision: Defines generally how close to the aiming point the ball will land based on where you hit on the swing meter
Forgiveness: Displays how much Distance and Precision the ball will lose if not hit perfectly
The nike putter is soft on putts under 10 feet, like it has rubber cushioning it. Add two feet in addition to what you calculate. Over 10 feet it is fine (and a very good putter IMO).
As for spin, yes some say full spin results in less spin. Hmmm I am not sold on this theory. Full spin does lessen distance but the backspin is still generated and at a greater velocity. However I seldom use full backspin, as you lose control of the ball when it lands. It pays to know where to approach to on the green as this severely impacts the spin. As a rule of thumb, I use more b/s to an elevated green with none or t/s to a green below your feet.
Never use less than 50% of power on a shot, it will invariably give a bad result. Use punch for these in inbetween shots - this is the most under utilized shot and add clubs to your bag.
With all your short shots, work out how far each shot flies, and then rolls out with all the spin used. This will dial your short game in.
Finally, whatever clubs you use, especially puuters, take your time to understand the clubs, and what they can do (and if you change balls, this will throw yardages out).
Forgiveness is nice for someone like me who cannot hit the ding frequently, but prescion is required the further you move back on the tees.
Hope you can make some sense of my ramblings