Re: What to do with a rogue left hand?
I feel your pain. I was a long-time traditional player who switched to matched grip. I still have to devote more attention to the rogue left hand, even after years of playing matched.
There is no substitute for practice, but, like MikeM, I have too short an attention span to do something torturous and too repetitive. One of the best things I did was to practice playing open-handed or left hand lead. I don't perform much this way, but it has been great for teaching my brain to think of the left hand more like the right.
Then there are still days where my left hand feels about as useless as a club with digits, lol. But it's really not that bad.