I thought of one more thing I would like to add.
Here is a comparison between the putter I use and the one that I have to use when playing in the European eTour.
As you can see, there is a very significant difference between the two, and in the big picture it does make a difference.
That said, when I play a round on the eTour, I do not notice any difference at all. It virtually does not effect my score. I have hit over 114,500 putts and it is still such a small difference that I do not notice.
So part of my recommending that you wait to upgrade your putter is because you are close enough to level 98 that you might as well wait and get the very best.
Also... When I say to work on your putting it is not meant as an insult. After my 114,500+ putts, I am still working on and improving my putting. My putting stats and ability are virtually improving every time I play. It takes time.
You also mentioned, "rarely am I in the zone where I get to use the wedges". For myself, this is crucial to good scores and good putting. My biggest weakness is long irons, but those wedges are deadly accurate. So longer off the tee (in the fairway) should really help as long as you can keep it out of trouble.
Once again... good luck.