Hi Indica

With the big Fin-nor you have, line capacity with braid is not going to be an issue :-) Braid is way skinnier and lighter than nylon, that is why it casts so much better. 10-20% further is a rule of thumb, and much more immediate hook sets too.
Like JK says just run it at roughly the same drag settings you use now...maybe a shade heavier won't hurt, and then if you need to really apply the brakes, well, you have that extra you can use on the drag. I used a 10-15kg kilwell rod for years poppering in the tropics, no problems loading it up with 50lb fireline and giving it death.
Can't help with what brickbased fishoes need from a braid, but perhaps a slightly thicker brand like the black magic/surecatch stuff would help. If you get the stuff with the colour bands in it, you can tell how far you are casting and how far away your fish is too, which can be handy.
I have always preferred using fireline for casting with spin reels, but am starting to try other braids. If you really want ot be sure, use 50lb fireline, but man, that stuff is thick as rope compared to the newer braids. It way over tests too... 50lb fireline is more likely to break over 65lb than nearer 50!

awesome thanks for the info,
i would assume giving a 10-15kg rod with 50lb from a boat abuse would put the rod under much more stress than off the rocks due to line angle so that increases my confidence the rod wont blow up a lot more haha.
thats good i was originally looking at fireline so will giv that a try first, the hunting and fishing shop up the road from me has suffix braid on special atm but havent heard of anyone on here using it on spinning reels so decided against getting it

yeah i guess thinking about it the stretch would hamper things a bit
what sort of price range does the xzoga braid fall into?

sweet as will spool it up when i next get the chance, thanks for the info everyone, now i just need a kingi to jump on and see what its like hanging on... havent caught a kingi yet unfortnately, cant wait to feel how grunty they are though!

Threw over deliberately or accidentally?