I would just say that there are many less variables in certain aspects of the game..
For example hitting or not hitting a fairway only offers two variables. You do.. or you don't.
As far as your putting statistics.. perhaps you've been having much more success with the stick? IDK.
I really don't know. I'm trying to be helpful but maybe it's all dependent upon some secret WGT algorithm!
In terms of basic math.. or even advanced math such as trig and calculus... it's very difficult to figure out what computations they use and how they apply them. These are things that are WGT's best kept secrets.
I would simply suggest to just play your game.. and check it again in few months.
Also are you referring strictly to forms of (ranked/scored) stroke play? If not what other element of play?
I'm trying to explain it... but alas I don't have all the answers.. only WGT does and they don't seem to like to talk too much about this kind of stuff! lol.
GL Cheers.