I've had the X01 for almost two months now, and I've been getting good results with the orange wheel. I switched to the ruby wheel and I'm still getting even edges, but I'm seeing waves in the hollow. I try hard to keep even, steady pressure for each pass, and it feels and sounds like I am. The waves are mostly smoothed away with the final, oiled pass, and skating doesn't seem to be negatively affected. But seeing those waves is discouraging and I'm assuming waves in the hollow means there's some sort of unevenness in the edges that I can't detect by sight or feel. This might be fine for a beer-leaguer like me, but I don't want to be unwittingly hampering my six-year-old son's development as a skater.
Any tips or suggestions for the ruby wheel?