How wide is too wide? Try comparing the dovetail with a Swedishicon Mauser. They seem to have dovetails a bit wider than the other Mausers. If that is not enough, I reckon you need a foresight for a

BTW, what hold are you using? 15" high at 100 is a bit much IMOH. That said on the basis of my Swissicon G96/11, which is about 25 cm/10" high. You need to use a 6 o'clock hold, if you are not already doing so.

Patrick