you can add chances too i once had a chance to contact devs asking about chances of amping andthey said 100% +1 50% +2 40% +3 30% +4 20% +5 10% +6 8% +7 6% +8 4% +9 2% +10 thier answer was this i think but im not sure maybe i forgot i wish i recorded it but im sure about +1,+2,+3,+4,+5,+9,+10