The Multistrada was too tall for me as well, also 5'9 and ~30 inseam. Have you considered the 990 SMT? I sat on one a few weekends ago and it's really nice. My 5'10 gf thought highly of the seat and the legroom. I'm holding out for a test ride before committing to it.
2002 GS500 Foul Weather Beater Bike
2007 SV1S Commuter, Tourer Terror