The part of your route i refered to is a cracking bit of road and i would not alter it, by mentioning it i was trying to give you a heads up on how it may take a little longer or a lot longer than you imagine, i was not trying to put you off doing it in any way, only you and the people you are traveling with will know what mileage/time you wish to spend on the bike, or where you need to be and at what time.
There are are parts of your route that many would suggest alternatives to, but the bottom line is its your trip so go where you want to go and see what you want to see, and most of all keep an open mind and be ready to deal with any changes you may have to make. Nothing is written in stone and there will be plenty of places to stop at if you do have to alter your plan, just poll up somewhere and you will find a place to stay, or alternativley as many do, use booking.com or similar for your next stop.