Ryan,
My dad has a 69rr that has a very mild 440 with a 4sp with radials in the front and m/t et slicks in back. It wandered all over the track and went 114mph. Had a similar issue with my old drag car dart, radials in front and bias m/ts in back. Went to bias in front also and could drive with one finger. Some cars can pull it off and some dont for some reason