Originally Posted by FormulaMMM
Before you go crazy replacing this and that with regard to suspension and mounts, consider the obvious variables that may be contributing to the difference.
When I went from worn Contis to an RS-3 square setup (on my '08) it felt like Adrian Newey re-engineered the suspension and balance.
Everything that you describe save the groaning noise in the cabin (?) could be attributed to tires.
Changing from Contis to driving on the bare wheels should actually be an improvement.