Try the Trial and Error program
Sometimes having a heavier hook can work out better depending upon what you're trying to accomplish and the circumstances. If you're fishing a freestone water with heavily hackled flies might work better since you're using a heavier tippet and you have a strong fly. A heavier hook might set on the water that looks better than using a finer hook. I would tie just a few hooks with the heavier type and using traditional dry fly hooks and test them side by side to see if there is an actual difference. I bet on certain days that heavier hooks might be better. We're not dealing with any hard and fast rules...