I'd suggest listening to Iron Maiden more. They made a lot of trademark metal moves famous, like the age ol' two 16th note and one 8th note riff pattern, commonly referred to as the "chug" riff. That and excessive tremeloing.

I'm with 6strngs. You're being redundant with the additional drummer and most likely with the extra guitarist as well. You don't need another guitarist playing power chords to get a louder and heavier sound if that's what you want. With that many of the same instruments you run a risk of getting a cluttered mass of noise.