The Ego Pinetarsol range is also really good for dry, flaking, scalp..especially if it's dermalogically (excema related) for example.
It's made of Pine tar, and smells a bit strong, so if I need it, I usually put it on at night, and the smell goes away by the morning. Or you could have another shower in the morning.
Question: Are you using shampoo & conditioner at the moment that has strong essences? You culd be allergic to the perfume in your shampoo n conditioner, which may be giving you dry/flaking scalp.
I highly recommend Pinetarsol