My quest to improve the handling of my 2009 california vintage has progressed.
I changed the rear shocks to IKONS and dropped the front forks 20mm in the tree, this alone made a great difference but still had some stability issues at speed, 130kmh to 160kmh.
So I removed the front screen, this eliminated all wander and bike is now stable at speed, in short it handles like a tonti frame Guzzi should. I realise this is a trade off from some protection but well worth it in my opinion.