It took me a lot of trial and error to get some consistency on all green speeds. Although I'll never beat the wedge users in the WGT Blitzes, (tour greens only) I'm confident of getting good scores nonetheless.
Below is a rough guide for the CTTH putting challenge on tour greens. The position of the direction line markers (1st-2nd-3rd-5th), the green markers on the power level and hit line are not exact but a good guide. The wind speed and wind direction do affect the ball movement, -especially on the 8th- so adjustments are needed where necessary. For other green speeds on the 2nd-5th-6th and 9th holes, you'll need to change the power distance length.
With trial and error, this should improve your putting. It won't be good enough to beat the wedge users in the Blitzs, but at least you'll be able to say you're a competent putter, (with a putter) if not already. You should even get some aces. The free starter balls are good enough for CTTH putting and the meter speed is not fast. Good luck.