I just recently did my first master with Ozone 4 on my own metalcore project that I also mixed and while coming from next to no real experience I can already say I learned ALOT about how the mastering process and the Ozone tools will effect your sound. With loud music such as this you will be constantly slamming into the limiter or the "loudness maximizer" thing on Ozone. Many recomend the "intelligent" settings with a "transparent" release but i find that to flatten out the sound TOO much. I much rather prefer the release between 2-3 for fast and loud. Even still, you may have what you think is the best mix in the world, but as sure as time will keep moving forward you are going to lose your drums. It is IMPERATIVE to mix your snare and kick louder than normal if you are going into mastering with a single 2-track signal path. Also, it is critical... CRITICAL to master on a different system, with different monitors, in a different room, on a different day. Hell, give it a week! I found Ozone to work great for me, It's like mastering made easy, all in one handy tool which is GREAT for the less experienced M.E. such as me and the OP. As for guidlines.... I guess you got all the help you could really ask for buried somewhere within these posts. Cut your inaudible sub frequencies, try to keep an RMS value between 10-6, expand your highs, use the harmonix maximizer VERY SPARINGLY if at all, if you need mastering reverb you're mix is terrible, and although the memory eq tool is great and all your mix is unique to your own sound so trying to emulate or copy another persons final mastered eq and applying it to your own is not often a good idea. My $.02 have at it, we all get better with practice!