This is how I learned to cast with my weak hand on top while avoiding frustration: When we step into the top of a run to fish, we typically start real short, with just the tip/leader out, and work our line out a couple pulls at a time. Make it a habit to always use your weakest casts here, when starting short. Continue using the weak cast, adding line two pulls at a time and fishing the casts out, until you get enough line out that your casting starts to fall apart. At this point, without frustration, simply switch to your stronger cast and keep fishing. Keep doing this at each new run, and at some point your casting with your weak hand will become good enough that you never find the need to switch to your “stronger” cast. Go Cougs.