One thing to keep in mind is that you can tell it what type of bonus you are applying. If you do that, it should avoid stacking things that don't stack. For instance, this is what I use for enlarge person: +2 size to strength -2 size to dexterity -1 size to attack -1 size to AC Since I have "size" in there, it knows what type of bonus/penalty is being applied. If I don't have anything like that right after the number, then the sheet won't know what type of bonus it is and will stack it with everything as an untyped bonus. Hopefully, if you get all the types in there, it will do stacking correctly. Obviously, reduce person would use the same thing, just switching the + and - at the beginning of each line.I'm not sure if having the _bonus on the end of the attribute names messes with anything or not. It shouldn't, but you might try just the simple names I am using. I just tested a Reduce Person buff on a character and it added 2 to AC and Touch AC (1 from the +1 AC, and one from the bonus dexterity) and the flatfooted AC went up by 1 as it should. The buff I used was this: -2 size to strength +2 size to dexterity +1 size to attack +1 size to AC As far as natural armor goes, hopefully getting the correct bonus types in will keep it from stacking, but I haven't played a character with anything beyond an amulet of natural armor for that type of armor bonus. It is possible that there are issues with that particular buff type. If you haven't looked at the wiki already, the list of buffable stats and some examples of how to write them can be found here: <a href="https://wiki.roll20.net/Pathfinder_Official#Buffable_Stats" rel="nofollow">https://wiki.roll20.net/Pathfinder_Official#Buffable_Stats</a>