DonM Now what I think happened is that for whatever reason I made a good setup with the Vertex, that I wasn't with the gamers. Why? In a few words, I had to think about it with a new look in front of me, instead of just stepping up without thinking.
I think this is true of lots of golfers. Change the factors of the components making up a club and subconsciously make huge swing changes....usually tempo is the largest change and waaallllaaa complete chaos. Go back to your usual set up keep same tempo and there you are in a great performing club again. This theory assumes you have correct playing length, lie, grip size etc etc.