line # is really related to experience and the style of fishing, or quality of equipment even, add personal set-ups on brakes and magnetics too, IMO. personally i get by with 65# super braid on my 400TE's and 30# original spiderwire on my 250TE/DC. for one i don't figure 8 anymore so these work well for me. for anyone who does this would be pretty light. 100 or even 125 would be the line to use. violent boatside hits with an inch or two of line off the tip are stressfull to line. 65 would be insta-snap for sure, unless experienced in it. i keep my drag relatively looser than it needs because i trap the line between the rod and my thumb for the hookset. if tighter drags are used 65 would be light.
two, because of frequent backlashes caused by inexperience, cheap or reels set wrong, or just hardnosed style casting 65 would snap pretty easy on a backlash with a lure normally used for muskies. so 100 or more would be needed. lures aint cheap and watching them fly away would hurt. also thicker heavier line backlashes less so is easier to cast. stiffer also. though distance takes a hit.
as far as backing it's a genaral rule to try and keep the backing at or just above the same diameter as your mainline braid to reduce the line digging in. the tighter the backing is wound the better and by nature thicker mono lines don't wrap as tight and stay as tight as a smaller diameter will.
good luck. i'm going shorefishing at the mississippi this morn.

i have a feeling i'm in for a good day.
