My putting game at distances greater than 50-60' or so is fairly accurate (where I line up throwing shoulder pointed at the basket, fan grip with my index finger tucked inside the rim) and my putting game at less than 30' is very accurate (where I face the basket directly and quick release with boost from the palm, fan grip with index finger on the flashing).
There is an inaccurate gap in there, about 30'-60' distance, where the shorter technique lacks power and the longer technique is too powerful. Using the shorter technique, it is easy to lay up for the following putt, but I'd rather be going for the chains in the 30'-50' range.
I think the finger spring will help me to close this gap. Or at least I hope so. For now, I try to avoid having to make putts in this range by having a better drive or more accurate approach shot, which often works, but there are times when this pops up and it would be nice to be above 50% in the 30'-50' range.