For "Big Game" in that period of the war, try the area west of Shetland/Orkney/Hebridies. The RN was too smart to send capital ships into the North Sea and within reach of land based airpower unless it really had no alternative (like in the Med.). This ain't no WW1.
If you are patient and lucky, you should eventually find a task force of 1xDD and 2xAMC patrolling between Faroes and Hebridies. They're not capital ships but it's a lot of easy tonnage. You just have to find 'em...
