Yes, 2 roosters is too many roosters for 8 chickens, and it is WAY to much rooster for 8 pullets.
Is this your first time with chickens? Are all the birds in the flock the same age? Because when you start a flock, the rooster chicks will out grow and sexually mature long before the pullets are ready. Because they are bigger, they often become bullies to get their way. They can be very aggressive to people too. If that is the situation, I strongly recommend culling both birds, and wait till next year to add a rooster.
If you have small children, under the age of 5, I HIGHLY, STRONGLY recommend getting rid of both roosters. They tend to attack children first, under the age of 5, they are attack at face level. Then they attack women, and lastly men. Perhaps not all of them, but if it is your first year with chickens you might not recognize the signs until a full blown attack. You have years to have this hobby, take it one step at a time.