Maybe your eyes aren't aged enough...give them time

I don't have a set on my 1911, but I do have a set on a G21 and G23.
For me they are much quicker to get aligned than trying to "balance" the space aside the front sight in a standard sight.....both when in a hurry and for aimed shots...granted an aimed shot with XS sight won't be as pin point as with standard sights...
My XS sights on the Glocks, both of which have LaserMax guide rod LASERs installed, sight just below the laser dot. The Glock LaserMax sights are not adjustable.
Not sure why they shoot low for you... With the Glock, the XS sight comes with different height front sights for different models...perhaps to adjust for caliber/trajectory?
If you got the Big Dot front sight, perhaps the standard front might suit you better?