I'm trying to tie a 70 turn bimini twist on my castway 20lbs braid and it seems to break easier then my 6lbs fireline (with same knot). I know that the castway is 20lbs tested but is 6lbs fireline really that strong or is there something wrong with my knots? It breaks dead at the top of where the line turns back over itself every time I can break it with my hands but the fireline cut into my hands (proper cut me).