I would have never been throwing 14 lbs if my fit was right. I owned several 15s and 16s when I went from thumbless to using my thumb. The Pro Shop
that drilled several of them didn't know I was bowling thumbless and drilled it expecting me to use my thumb but apparently it was stretched. After a couple of months of using the thumb I had wrist problems, and being a drywall finisher not having my hand and wrist hurting is a must. Thats when I made a wholesale change to 14 lbs and used them for right around 2 years before I found a good Pro Shop
that fit the ball right. I've been thinking of moving up in weight for the past half a year but with the pain I was having with 14s with the bad fit it wasn't going to be a good thing. Now the main adjustments will be moving the thumb pitch forward when I'm ready for that.
I also just noticed that you have a birthday cake next to your name RotoGrip. I'm going to assume its your birthday so Happy Birthday.