Dear Conrad,
thanks for performing this tour. I like Corsica very much, as well I would take Sardinia, if would have more time. Even I think, this is a very good season in autumn, when you spent there - as well for Sicily. I'm not sure, you get the right road from Viareggio to Pisa. I remember a small road with green leaves over my head and little traffic close to Pisa. But this was about 10 years ago, maybe this has changed. Even some country roads here in Germany has doubled the traffic within 10 years. All the best for your next projects!