I fished a couple of weeks ago with a buddy of mine, we longlined tandem 1/24oz jigs. I had Mr. Crappie Hi-viz 8lb line on his rods on the back of the boat, and I ran 6lb test on my rigs from the front. I ended up catching quite a few more fish than him, gotta figure it had to do with the 8lb test since we were running several of the same jig colors. Believe my jigs where maybe just running a little deeper.

I think 8lb is fine, just run a little heavier jig if the fish are a little deeper in the water column. You might just experiment and run a couple with 6lb and couple with 8lb.

Good Luck!