Ten-pound test line is the heaviest you should consider using, unless you use a light leader with it. Also, if the water is crystal clear and you're trolling at depths less than 30 feet, a general rule is to troll lures at least 100 feet behind the boat. Troll lures at speeds of 1.7 to 2.5 mph if you have a speed indicator on your boat. If not, watch the action of a spoon boatside. If it's spinning, you're going too fast.
Browns usually don t like a spoon that's spinning.
If your spoon is barely wobbling, you're moving too slowly. What you're looking for is a quick wobble that makes the spoon dart around. Spring brown trout are very selective, and on some days choosing the right lure is the difference between success and failure. In clear water, lures with natural finishes work best. Fish them on ultralight to light rods and light line with tiny crosslock snaps or snap swivels.