You Shouldn't be using your heaphones only, you should use both, your speakers and the heaphones. But most importantly your speakers. The Dr.Dre Heaphones are not really made for beat production. yes it might sound better to you, but then you are creating the music specifically for those headphones so other people will not enjoy it.
The bass and the very booming kicks like on the 808, should'nt be too lowd. you should EQ both of them and try to identify the frequencies that are causing distortion and phasing out with the rest of the song and attenuate them accordingly. Don't remove all the bass tho', just make sure its not interfeering with the song.