Cycled to Tobermoray last august. The route I went was Erskine Bridge, Helensburgh, up to Arrochar, over "the rest" through Inveraray, along Loch Awe past Cruachan Power stn, turn left at Taynuilt onto back road into Oban through Strontoiler and Glencruittein.
Pretty unlucky in that I got a NW-erly all day so no head wind pretty much all the way. Main climbs are the "rest" and out of Inverary up to Loch Awe. Bit of a downer when you climb up to Loch Awe then have to go in the opposite direction for a while to get on to the A85 when you can see the road straght across the other side of the Loch.
Great Cycle though!!!