sprite scaling

Hello. So far in my modding journey I've been using Kartmaker and the associated templates. Right now I am attempting to create a character using a higher resolution sprite. Right now I am using the asymetrical template...

I don't want the sprite interpolating when changing sprite size. I want to make it instant. Is there a way to do it? someone said that P_SetOrigin probably solves it but it didn't work for me. Print lines tells me it changed to the desired scale instantly but visually there's interpolation...