BMW Rawhyde Adventure Taining in Castaic, CA
Maybe I missed something, but there's a BMW-blessed off-road training course right off the I-5 on the gapevine that is really a good course in handling the big dual-sport bikes on just about every kind of skill set needed. A great training program, lodging, meals, rentals, you name it. Friday evening through Monday morning. Two full, hard days of well-taught, gradual step training that will definitely get you better.
Google Rawhyde BMW Adventure fore more details.
I went and learned alot. I do recommend renting one of their bikes, cause you'll definitely learn how to pick it up!
Good luck and PM me if you want to talk about it.
2013 R1200GS K25 (Camhead) Triple Black
2007 F650GS Dakar
“Life is what happens to you while you're busy making other plans.” ― John Lennon