I was struggling with my red-line at NL5 (Yes, I'm trying to follow in your footsteps through uNL). To fix it I:
- Tightened up pre-flop
- Tightened up a lot OOP pre-flop
- C-bet less and on dry boards c-bet smaller
- Fired more 2nd barrels
- Value-bet river thinner
- Started calling river bets when I know villain has it (

)
Generally just figuring that playing a stronger range means I have to fold less often.