Well Ryan I guess I'm a bit late to give advice on the 20kg+ barbel trip. The problem is probably that you planned the trip on the sly and didn't invite us along.
My rig is a sea Daiwa reel on a 6' boat rod with 130lb dacron on it. I fish lures since it's more productive and a fairly large loodkop does the trick.
The reason for such heavy line is you have to be able to haul the large barbel out in between the trees - you can trust me on this one, Nylon and braid works in open waters, dacron works in the trees. The dacron doesn't cut into the tree as badly as the other lines. Don't use such heavy line if you cannot handle it, some of those big barbel didn't get to that size for nothing.