The file containing the problem is: "Periscope_Mask_1024_SH5" ( the "skin" for the periscope view with reticles ) and not RAOFB stuff.
I've made some modification to the file ( it took me a while since I'm not very good xD ) but I must say that I am quite satisfied with how it turned out.
The point of all this is to have a reliable and precise centiradian scale on the periscope reticle without necessarily using the "orange" filter that appears when you click on RAOFB and also because otherwise the periscope lattice would only have an aesthetic function.
The grid present in this file is calculated with the highest possible precision ( 1 pixel ) and corresponds perfectly with the RAOFB scale:
Maybe someone might be interested in this change.
If you want you can incorporate it in your mod otherwise I'll try to upload it myself (even if I'm not sure how to do it).
I would add that at the moment only the attack periscope has been "fixed".