I agree you could use the 25-475 classic Stern coils. However, in my experience 6.5 degrees is almost too much for this game. Everything is fine except for the tube shot. Mine is set right around 6.5 degrees too and some tube shots seem weak. I used to have it set at 7.0 degrees and had all kinds of problems with the tube shot. I need to try a pair of 25-475's in mine.