Hi Lucee81,
You dont have to go overboard with really heavy gear and concrete blocks for sinkers.
Anything up to a 2knot current you can get away with a pound of lead or if it gets bad put 2 sinkers on.
Its just the wind drift that will upset things but you can always get the captain to motor into the current or wind and hold position
If you are going to use a deck winch loaded with 150lb line it will definitely be a skulldrag but go the rod n reel way and these fish will fight well while they are down deep but float up once they get close to the boat.
We have had to chase the fish a few times to keep up with them and getting them off the bottom can be a big job.
Try putting a SP at the top swivel on your dropper rig as there are some big Nannygai out there that love SPs.
The worst part is winding your line back up without a fish on when your bait goes and thats why I use jigs n SPs at times.
Once you get over the first couple of windups the pain goes and it doesnt hurt anymore
Good luck n lets us know how you go.
cheers, steve