I have a T8 with an SG-250 waterstone. I have been using it for a while and just recently went to true the wheel. I noticed as I moved the carbide cutter from the inboard side to the outboard side that the cutting sound changed significantly. I have a flat stone, but now when I grind a chisel, the grinding sound is very different on each side. On the outboard edge, it sounds much coarser. I have tried the grading stone with no luck. Any ideas on what is going on?