Advice on gear for Cortes Bank trip

[Zpearo]

Some friends and I are going on a trip to Cortes Bank and I'm looking for a bit of advice on gear, as I've only done shore diving before (SoCal, CenCal, NorCal, & Hawaii). I've got a 130cm gun and will have extra shafts, bands, shooting line, etc if I have any gear problems while on the boat.

I am concerned about terminal tackle though. I'll be bringing a floatline and would prefer this over a reel, but only have a flimsy 1atm inflatable float to attach to. The target fish for the trip will be YT and WSB, but I'd like to be able to shoot a 60lb tuna if I saw it. Should I get a hard float (or bluewater inflatable)? Should I get a bungee line to put in line with my floatline/float? Should I get a reel to allow for some extra run (and maybe keep from spooking WSB with a floatline)? I don't want to spend money I don't have to, but would rather buy quality gear now and have it forever than miss a fish on this trip because I wasn't prepared.

Any advice is appreciated.