Some wild game meats will have a stronger meat flavor or gamey flavor to them, which will mask a bit more of the seasoning and it won’t be quite what you expect if using just pork/beef/etc. So, if you’ve experienced that with some other bear sausages, you might try, as you suggested, to use a little extra seasoning when making bear sausage. I can’t give you too much detail on how much to use though because I’ve never made bear sausage… One thing that can also affect it is the fat content you use. More fat will help the flavor be a bit stronger and noticeable, so you could try adding a tad bit more pork butt, or just try to use pork with a higher fat % to help increase your overall fat ratio. I notice this a lot when making very lean chicken sausage and the flavor is not as strong with very, very lean meat than if I used the same seasoning in a fattier pork sausage.
I hope the pepperoni turns out great for you this weekend!