2.0-2.2 good low
2.4-2.6 medium high
3.0+ is not insane, but getting close
If linville is among the harder things you have done, 2.0 is a good first time level with 2.2 being good if you know the lines.
If you know it and it is relatively easy for you, 2.7 is optimum.
If nothing else is running and you are already there, 1.8 provides enough water to still run everything and it beats the green at summer flows.