Sorry, I found this confusing. The 4 "hens" hatched May 19 of this year are actually pullets, as they are less than a year old. You say you also have 4 "pullets." If they are over a year old, then they are actually hens.
As others have said, what you have are two cockerels and 8 females. A general rule of thumb is that a good ratio of males to females is one male to about ten females. More males tends to result in overbreeding, resulting in damage to the hens: loss of feathers on the back at least, and sometimes even a breakdown of the skin, injuries around the wings, to the head, neck and comb, etc.
As you are discovering, two males to eight females is unbalanced, resulting at this point in difficulties between the males. It probably won't get better. At best you will end up with a sad, lonely, bachelor male. At worst ... well, as others have said, cockerels have been known to fight to the death.
Good luck!