I was on the Tyga website yesterday. It looks like I was talking out of my bottom earlier!
For the side by side exhausts they state they will fit with standard rearsets.
Not sure on the GP exhausts though.

Are you using the standard manifold exhaust gasket between the flange and cylinder, or have you fitted the flanges direct, without the gaskets?

Those spring type gaskets are about 8mm thick, if I remember correctly.
Might give you the little bit of play that you need.