Batted balls? Not much outside of playing on varsity maybe. The problem isn't that the LBs jump high, it's that balls are thrown too flat by the QB. try taking a little off the throw to add more arc (i.e. push the button less hard).
To really emphasize the speed differences in players lower the speed threshold. I play on 0. As it goes higher speed differences matter less. Also remember acceleration plays a big part. That 82 speed linebacker might have a much higher acceleration and is able to catch your RB before he gets up to full speed.