don't throw spinnerbaits on a heavy action rod with a stiff tip.also adjust your reel tension.there is no reason you shouldn't be able to cast a spinnerbait with 17 and 20 lb line.magnetic brakes also do not control backlash as well as centrifugal brakes.dual brakes are the best of both worlds.the pro qualifier has them.the best brake imho is the adjustable centrifugal brake on the abu garcia mgx.