Never had a problem with fish hitting with sub troll in the water. Dont look at it like, I need to hold a certain speed because everyone one says thata the speed to hold. Every boat trolls different, and thats a fact! I always run my probe to what the fish want not what I want. As far as blow back a heavier weight is definitely the way to go, adding a probe alone will cause quite a bit more blow back then one with out. Just my 2.