Hey guys, quick question:

How do Blood for Blood and Heavy Thrust's damage multipliers interact? They don't stack additively (30%+15% =/= 45%) and the damage result looks more like 35%. For example, with Blood For Blood alone my Full Thrust does ~960 and with HT added it goes to 1003. That's just a +40 damage increase, so would that mean B4B plus HT equates to a 35% damage increase or is there a unique formula I don't know about?