'jk' are on the strongest two fingers on the right hand home row, since that's what you'll be doing the most. 'h' can be hit once or twice with no real effort, but there are better ways to move left and right within a line, such as `bBeEfFwWIA`. I also remap `H` and 'L' to move all the way to either end of the line, but I might be doing it wrong

I just use my index finger for both j and h. Are you used to the arrow keys? I noticed with jkl;, my fingers line up with the arrow-key directions.