Not sure what version of ReShade you are using. You have to use version 4.0.2 in addition to 3Dfix for DOA6 in order for it to work properly. I've made an installation tutorial a while back because I struggled with it myself. I assume you'll also need to get a hold of an older version of the raytracing shader as well. The lastest version didn't work for me. Goodluck.