Wobbly skates?

[this guy 0]

I recently got a pair of Grafs from Buzz and noticed when I start going really fast, the skates get a little wobbly. I have no idea what could be wrong so I am asking you guys for help. Holders not alligned maybe? Its not when I do crossovers to gain speed but when I coast at or around top speed is when they start to wobble. Thanks in advance.

[jimmy 194]

uneven edges or inconsistent hollow