I'm not the most consistent player in all of WGT, but I have had my good days before.
For me consistency comes completely from the approach. Sure, putting well is a huge bonus to your game, but making 9 or 18 1-putts from outside of 10' is almost impossible to do.
Hitting the ball close and giving yourself a birdie putt inside of 6' is one of the best things you can do to keep your game consistent.
So go out and take notes on all the courses. Note every inch downhill, uphill, tree positions, green slopes, traps, glitches, angles, rough depth, wind effects, and every single other nook and cranny in between. Keep taking notes until you know each course so well you could draw it on a piece of paper while blindfolded.
Hitting your approach shots close time after time requires memorization of the courses, and you'll see more consistent scores when you're putting from close rather than far (obviously).