I just got the same pack.

I've heard that you can squeeze an extra inch or so of torso length, but have not tried this myself.

Normally the velcro adjustments are supposed grab several (3?) loops. By grabbing one less loop, you can get an extra 1" or so in length.

Of course, use your common sense if you do this, your mileage may vary, I'm not a lawyer, enter at your own risk, yada, yada, yada, and e pluribus unum.