That result is expected, since you're messing with the gain staging at multiple points in your Mixer.
I have no idea why you're taking steps 1, 2, 3 and 4. What are you trying to achieve? Is there an issue you're trying to solve? There's no reason to mess with your gain staging unless you're having a specific issue, but you haven't described one.
+1. Either you use Ozone, or you use a mastering engineer - not both.
Ozone is used as mix buss compressor and eq, not as full mastering tool, I could be using an API 2500 or any other compressor, that's why the engineer (and he's very reputable and well known, that's why I'm not naming names) preferred the track with it.
Anyway to answer David's question, I finished my mix and need to drop 4dB, I read your posts about adding the Gain plugin to each track but I'm not happy with the result because it's quite off. I don't use all 4 steps together, I tried each one independently.
Thanks