I was thinking of using a Damage Multiplier technique (DE version) with Muay Thai, but i'm not completely sure what gets multiplied. The text of Dam, Mult. says "in the case of attacks with some other added modifier to the Damage, the multiplication is always performed before adding any other amount". Now, muay thai says "damage: 20 plus quadruple the Strength bonus of it user."
The part that has me uncertain is that the Muay Thai language isn't like other places in the rules where is might say something like "20 Base Damage plus Strength" or "Base Damage of 20 plus...". Is the damage that gets multiplied the total of 20 plus 4x Str or do i multiply that 20 and then add the x4?