Not a stupid question at all. If the 1910 has English proofs then the sights would most likely be in yards, or at least supposed to be. The fact it shoots high is not uncommon with older rifles, especially the Mannlichers. My 1903 shot high about the same amount with 160 grain bullets at the original velocity regardless of what changes I made with the reloading. I then bought a taller front sight from NECG which needed some modification to fit the original base. It was the shortest taller base that I could get but then the rifle shot way to low. So in the end I 3D printed a number in plastic in 0.004" steps and kept progressively going higher one base at a time until I found the correct height. Now it works perfectly, just have to make a new base of that correct height in steel and brass.

You could file the rear leaf but you might find that you very quickly can't see the bottom of the V any longer as they are often quite low to start with.

As I can't use the NECG one you are more than welcome to try it and see how much effect it has on your rifle. If you PM me your details I will send it over.

Matt.