Hi Mike, good to see you posting in the forum!
We both have/had a good opinion of Cunnington coming into this season. The difference in his situation is, we were looking for him to take a step up in his scoring, rather than just repeat a previously established scoring pattern. The question you need to ask yourself is, do you still have faith he can take that step? If the answer is no, then a straight swap to Murphy/Beams is prudent. If you still have faith, then stick fat. Norths draw becomes a lot friendlier after the bye. The other option is to swap him out now, and keep an eye on his form and price, and possibly bring him back if he looks good. I'm sitting on the fence with him for now. I was hoping part of his improvememnt would come with more TOG, but that hasn't happened yet, but it is still early days. The safer option is to swap, and watch. The bigger gamble is to hold. I think in this case the potential risk out weighs the potential reward, so I'd go the safe option.
ps - thanks for the birthday wishes.