Honestly with out handling the blanks can’t really say. You probably won’t really notice a difference. The key to getting the most sensitivity out of a rod is taking as much moving weight out of the guide train. The Blanks are made from the same graphite. So it will be a small change. The 3.5 tip will probably have move flex to it.

off a guess I would say the 4.0 tip might be better being stiffer if it is. That’s the best guess I have.