yea impact and evap are both higher numbers to add more fuel, they are telling the ecu that more is sticking to walls and more is evaporating so it has to richen to compensate, yea 70 is pretty late if the boundary is 520 and u only have a few more deg overlap then mine was and i use 80-85 for mine but if its good and then bad after a start then there is something alse to dial in as mentioned, short pulse adder and min pulse is injector data and should be added to suit the injectors u have to correct them for lower PW