Why do top shooters shoot TTF and prefer thin frames?
Kidding sort of. Because our answer is that top shooters don't actually prefer through the forks instead of over the top and we're not convinced that they necessarily prefer thinner frames either.
Top shooters are often able to shoot TTF and OTT with great success. And if you look at the world championships, you will see that a majority are actually shooting over the top. This is consistently true at all world championships.
We understand it may seem that proficient shooters gravitate toward smaller frames because proficient shooters know that they are less likely to get a four kit (and may be willing to "risk" using a smaller frame) but there is no clear connection between advanced shooting and smaller frames. Frame size is more a personal preference than anything, and we know some of the best shooters in the world who shoot very large bulky frames. For example, John Webb shoots a large frame, and the top Chinese shooters are known for shooting frames with enormous ergonomic handles.
So what answer is that they don't. The top shooters in the world shoot TTF and OTT with the majority shooting OTT and they shoot frames of all shapes and sizes.