I called Jon Norman on your behalf. His only suggestion was a custom seat, but didn't think he's heard your kind of complaints before. Maybe he's got an idea for a steering wheel spacer, I dunno. He didn't think fooling with the seat tracks and shimming would do much good. He said the flying buttress seats put you in about the same position, though. He might have an idea for you with respect to the steering vagueness- I forgot to ask. There was a suspension guru, Bob Mello. I bet he's retired. If not, Jon probably knows how to reach him. Bob Mello was awesome.
ALFA PARTS - Alfa Romeo Parts, Spares, Accessories 800-890-ALFA