I am SUPER SLOW with my left hand

For 2-handed solving, you really shouldn't be using your left hand to turn that much; you should use it to grip the bottom-left pieces of the cube so R and U moves are easy to do with your right hand.
 
I have mostly made this thread because I learned the Ja perm as a left mirror of Jb perm.
 
I'm slow at it so I was wondering how I could get better with my left hand. I don't like using it and generally don't but I still wanted to ask. My curiosity never sleeps.
 
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