At the risk of starting a whine fest, I have a putter idea that I think would be good/liked by upper level players. I personally think it should not only be tier based, but also restricted to legend/tour legend. Make it 4 levels above the Ghost (lvl 92) just like the R1 is 4 levels above the R11s. (So what I'm suggesting I wouldn't even qualify for yet.)
Make the putter the same precision and therefore meter (feel) of the Ghost (lvl 92). Add 1/2 ball to forgiveness and 1/2 ball to balance.