IIRC usually these were set for 300m at the lowest setting, so yes, it will be a bit high at 100 yards. If you can work out how high it is shooting you could work out how much higher the front sight should be with a bit of arithmetic, saving you a bit of trial and error.
Essentially you measure the sight radius, and then divide this by the distance you are shooting (using the same units), and multiply the result by the amount you want to move the centre of your group.
For example, if you have a 24" sight radius, and you are shooting at 100 yards (3600 inches), and you are a foot high, you calculate:
(24/3600) *12 =.08"
In other words, for that set of conditions you'd want a front sight 0.08" taller.
Of course you'll want to measure your rifle's sight radius for yourself, and the correction needed on target (how much too high it is shooting). You may also still have to do a bit of judicious filing to get it just right too, but that should at least get you pretty close.
