Line- it all depends on water clarity. After the lake turns over, our water is dirty. it will clear up by late spring.
When it's dirty. like now, I use 4 pound line regardless if the water is on or off. Unless I start using Turner's micro jigs or a small fly (water off).
I know Babler uses 2 pound Vanish but it's diameter is comparable to 4 pound Trilene except it's fluorocarbon.
Even when the water is clear in the summer/fall, if the water is running hard, I use 4 pound. It's debatable if I'm missing fish.