Use a Nickel shaper and then use a curved shaper with sand paper to take the top down a bit.
Use a quarter to measure your progress.
Or just use the curved shaper and quarter and eyeball it.
Once that you get the shape that you like on your breaker, you shouldn't have to mess with it too much in the future, other than just checking it on occasion.
Thats the way I like my break and jump tips as well. Or that is the way most should anyway.