sounds like saeboherric dermititus, i get it and too have the solution like you.
i find using only herbal/natural shampoo & herbal/natural conditioner really helps, be sure you rinse well with clean water as not rinsing properly makes it worse. don't wash your hair every day, twice a week allows your natural oils to do their job in moisturising your scalp, the more you wash it the drier your scalp will become.
you know when you have an infection if there is puss under the flakes/scabs.
don't scratch or pick the scalp.. ok it is impossible i know, but do try as picking this is one of the main ways how infection is introduced.
make sure you rub the solution well in.
if mine gets really bad i tend to do the total opposite of what i just said and i do pick off the big crusty bits/flakes then put the lotion directly on the open sores, it stings like xxxxx for a couple of minutes, but really gets to work and clears up the area in a couple of days.
don't use the solution when your scalp is not crusty as it is a topical steroid and long term regular use can cause thinning of the skin.
blow drying your hair is not a good idea as it dries your scalp even more and can burn open/raw skin much quicker than it burns healthy skin.
if you can't get herbal shampoo try coal tar shampoo or try mushing up an advocado and rubbing it in your scalp then rinse off well, don't need shampoo at all this way!
be careful of hair sprays, best to avoid them- they sting like xxxx on raw bits
don't tie your hair up, it prevents the air getting to your scalp and hinders healing of raw bits.
use a hairbrush with rounded end bristles or softish bristles and try not to scratch your scalp whilst brushing as you can introduce infection by scratching it
wash pillows, hoods and hats in sensitive washing powder and unscented softener.

think thats all
good luck, oh just a thought but digesting cows milk in any form, butter, cheese, desserts, chocolate, straight from the bottle etc all make my dermititus worse, it is not noticable for a few days, and stays for a few days after i stop intaking dairy, but it is definitely a cause as it happens every time!

ps the solution here comes in 2 sizes of bottle, i think the smaller 30ml bottle (DiproSone) is twice the strength of the larger one and works for me much better.