The GSB is a good idea, just done the googlemapping and it is not much further, it comes in at 330 miles and 6hrs 20m, and I also get to go over the Col San Carlo again.
A lot of tough choices, but I have ridden the GSB / PSB in the very same direction before.
I have also just noticed that if you look at the "All around Mont Blanc" trip in the Motorcyle Journey's book from the start at Martigny I have the choice of the Eastern or Western half of the trip, going the "other way" gives me Forclaz, montets, Saises, Pre and Roseland which looks like a 5-3 result. Although the Montets is not so impressive I think the Saises and Roseland compete with the St Bernards, especially as I get to try them in the opposite direction to last time.
The other side of the lake also offers up Saises, Pre and Roseland so even if i choose these passes I still have the Montruex Vs Geneve choice of which way to go around the lake is best. I think the Geneve route is mainly Motorway and assuming congestion is not an issue would probably get me to the Saises fastest, with Montreux being the way to go if I fancy going over the St Bernards.
So now I have 3 choices:
1. RHS of lake taking in Forclaz, Montets, Saises, Pre and Roseland = 337 miles / 6.35 ride time
2. RHS of Lake taking in Grand SB, Col San Carlo and Petite SB = 331 miles / 6.21 ride time
3. LHS of Lake taking in Saises, Pre and Roseland= 354 miles / 6.21
I think the RHS wins, so a choice of option 1 or option 2
Any thoughts on which would be quickest / safest / least miserable if the weather is poor