I don't use Fat Gripz or any knockoffs but there's this item which is one Amazon recommends.
For sure. Others seem to be acting like it's weird that you're having some discomfort, but I think that's pretty silly. There have been tons of times in the past where it's taken me time to acclimate to a new EZ bar that has weird angles or a new cable machine attachment or something.
Though on that topic, you could maybe snag some ergonomic grips if it doesn't improve. They only cost like $15 to get some large-diameter rubber grips. Something like this or similar would probably still work with most dumbbells.
I had the same problem. Bought these and solved that issue. They are also awesome for the dip station if your tower has it. And good for increasing grip strength for bouldering etc. I'm sure theyre available other than amz, just an idea to avoid having to replace the tower.