Anxiety doesn't necessarily cause concentration problems as its own symptom. In fact, it could be argued that anxiety actually improves concentration. Anxiety is the activation of your fight or flight system, which is meant to keep you safe from harm by ensuring you're running away or fighting without distraction.
The first set up is a standard 20-25 pound test rig (depending on the size of the tuna) with a size 1 to 2/0 hook depending on bait size and the size of the tuna. Fluorocarbon leader can be super effective if the fish are touchy (biting infrequently). This set up will be the primary bait fishing set up.
When trolling for tuna from 3 to 5 rods may be used. Usually a couple of the feathers or jigs will be trolled father back and the other one or two closer to the boat. Use at least 50 pound test not so much for the size of the fish as getting the fish hooked and to the boat in short order.