I use an eight pd ball weight with an adjustable release clip on 1.2 mtrs of 250lb jinkai...trolling live slimies your mainline will hang behind boat in a curve due to water pressure..therefore it will be well clear of motor or anything on back of boat.,i fish anywhere between 30ft and 60 ft depending.on where fish are in water column..u can fish as deep as u like so long as your prepared to haul it back up.... haha...rick