Seems to me that making the handle longer might make it easier to reach, but the throw from lock-to-lock would increase dramatically also especially if it's a little sloppy already as you wrote.
The JD handle is very ergonomic (I have one also) but its better suited next to you down low rather that up and out in front as you found out. It might be easier/cheaper to get a different handle that's better suited for your machine.