Likely, you're waaay too heavy for the factory Bonnie suspension (almost everybody is). There are two things you should consider:
1) Put some better rear shocks under you, and upgrade the springs up front as well.
2) Give serious thought to replacing your shocks with something of comperable height/length as those the Thruxton come with; they're taller.
Have your sag/pre-load/damping adjusted by a pro' and have him explain what you can do to further dial them when you're out on the open road.
Rear sets WILL help to a degree (sans center-stand), it's all about whether you're comfortable riding in a more aggressive position. HEY, Europeans do it all the time!
1) Put some better rear shocks under you, and upgrade the springs up front as well.
2) Give serious thought to replacing your shocks with something of comperable height/length as those the Thruxton come with; they're taller.
Have your sag/pre-load/damping adjusted by a pro' and have him explain what you can do to further dial them when you're out on the open road.
Rear sets WILL help to a degree (sans center-stand), it's all about whether you're comfortable riding in a more aggressive position. HEY, Europeans do it all the time!