This is my area, i live in scrabster just along the coast and fish and surf this stretch between there and dunnet bay in my 3,8m SIB.
If you stay withen Dunnet head and Holburn head the tides are not much of an issue, Dunnet Bay itself is fully open to and any west wind and swell, There is good shelter from north winds and swell at the north east end of the bay and a very nice small shleterd beach for picnics etc called Peedie sands( small sands ) or secret beach about 500m round from the slip at dwarick. it is very much worth a visit. Very sheltered sun trap in N round to E winds and only 5 or 10 mins from the campsite in the boat. If the wind is strong from the west you can find shelter around scrabster and thurso bay 10 mins drive away, there is a nice slip by the yaught club in scrabster to launch from, Fishing is very good, mackrel, cod, ling and Sea Bass
hope you get some nice weather