, the front sight is too tall...
Maybe... or maybe the rear sight is too short?? seriously,,,
You've got other 1911s so measure the sights on them and on the pistol shooting too low, and see if they actually are different heights.
Is the front sight staked in or is it installed in a dovetail??
The sight and target alignment where the top edge of the front sight (level with the top edge of the rear sight) is held in the center of the target is called "Center hold" (is that what you are calling "dead hold?) The other common sight picture is with the sights lined up and the bottom of the bullseye is put on top of the front sight. This is called the "6 o'clock" hold,
Developed by bullseye shooters, using black sights, shooting at black targets, at known distances. It is popular in other shooting situations too, because using that style sight picture doesn't cover up the target.
There are also other reasons why they gun is shooting low than just the sights. Shoot the gun at other distances (and do try some at 25yds, just to see), have some other people shoot the gun as well. If the results are consistent, everyone shoots low at all ranges, then its probably the gun, and then its time to take to the maker. It might be the sight. It also might be a manufacturing error that has the barrel pointing "down" when the gun is in battery. That would be something the maker has to fix.
When asking questions, naming the gun by make and model in the opening post is never a bad idea. Just saying "I have a 1911 that does this..." is like saying "I have a pickup truck that does this..." Identify the make and model and you might find someone who has the same gun, and might already know if that model has some kind of quirks not common to the rest.