For your tunes I recommend trying 1) first mix the tunes so they sound powerful, dynamic, and interesting as an instrumental (mix with no vocals), 2) bring in the vocals until the words are intelligible. Try +2 dB increments until it sounds right on multiple sound systems. I don't say this because you aren't a good singer, but for this genre you want a lot of the power to come from the instruments, with the vocals supporting. If it was pop, you'd want the vocals more up front. Reference some fave songs in similar genre, and hopefully you'll hear what I mean.