Yea I have a Superstroke on it and tried both the 25g and 50g weights in that with them as well. It might just be me and this putter, I'm not sure.Keep in mind the SL shaft and the Allin are two different options. Not easy to plug and play as the SL has the weight in the grip. I think the weight missing might be at play here and a quick test would be (if you like the grips) a Super stroke with a weight in the grip to see if it gets better.