Hello hankir,
I would suggest you forget anything sporty! As a hint, what else gets "scored"? In my opinion 7a is a removal, and definitely both 30a and 30d are normal. Your assumption regarding a 5 and 6 split of the members of each group is correct. Some grid staring on that basis might help, it certainly did for me!
Off to cook dinner now! Actually,that is a euphemism for getting dinner using Sunday left-overs!