I had that happen. I turned the bracket around and it fit the can perfect.
Dunno if that will help you, but you never know. Oh and i left off one of the spacers as well. This was all to fit the akro pipe. Sounded like the same issue though.
Good luck
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Alex C
03 ZX-6 RR
Northern Va
Go Team Green!
Local Washington DC Area Riding and Social Gatherings Go here -->www.dcsportbikes.net
Dunno if that will help you, but you never know. Oh and i left off one of the spacers as well. This was all to fit the akro pipe. Sounded like the same issue though.
Good luck
------

Alex C
03 ZX-6 RR
Northern Va
Go Team Green!
Local Washington DC Area Riding and Social Gatherings Go here -->www.dcsportbikes.net