I think your missing the point of the adventure. I understand that motorways are good to cover massive distances in lower time but they are really boring and you will end up trying to do similar things like you are at the moment.

Why not either increase you time to complete your route allowing you to either cut the amount of motorways you use and include a good 50% of non motorway roads, or completely dont us motorways.

Other option is just suck it up that no bike is never going to be great at motorways and off roading at the same time. There are always compromises.

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Plough on