I run okuma leadcore series rod with an upsized reel I like the okuma coldwater 303d's or something similar in size versus the 153 size. As far as brands of leadcore just make sure they are the same, but the suffix advanced 200 yard spool is what I am switching too, when I respool. but depending on what depth you are going to pull a 100 yd spool would probably be ok, the advanced is supposed to dive better and more consistently and become less water logged than the suffix performance leadcore(cheaper). I usually run about a 15-25 foot fireline leader attached to a 30lb ultra small barrel swivel that will reel easily through the guides and reel, some guys tie their leaders directly to the leadcore though.There are tons of leadcore options and there is definitely some personal preference and a learning curve to using it, im pretty sure there is even some threads on here about it already.
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I run 18lb test as well