I've successfully used a Suntour Cyclone FD, a Suntour Mountech FD, and a Suntour XC Expert FD on a Sugino XD 46/36/26 crankset. However, these were all on 28.6 seat tubes. I assume your 750 has an oversized seat tube, which puts your FD further out. What size BB spindle are you running? You need a longer one for oversized tubes.