They're already individually tuned, cannon shells are much more accurate than firearm magazine bullets for example.
Unfortunately, to maintain mod compatibility, a lot of the checks have to be fuzzy and can be overridden by other rules. I also have to set explicit rules for specific mods when I, (or someone else) finds one that isn't properly handled (which is what I thought could have been happening here).
If I translated all of that into settings, it wouldn't make much sense to anyone that isn't me and any extra setting would invariably apply to other unintended ammo types... Unless I reworked most of the mod and added a setting for every single ammo type, base game, and modded, individually, but then I would no longer have the built-in compatibility that I do now and it would require constant updates.
All of that to say, probably not, sorry.