It's sometimes said that doing your own mastering is somewhat like representing yourself in a serious court case.
The one time I tried out mastering was at the suggestion of an acoustic group I was doing an album for. Since I had no idea what I was doing I used a mastering plug that had dozens of presets available to audition. I selected a few of them for them to listen to that seemed to possibly improve the tracks and they wisely chose to send the tracks off to be mastered.
The nice thing about doing that was to watch all the different parameters of the mastering plug and see what was being changed to create that particular preset.
It sounds like the best thing for you is to leave it where you like it. Stacking more changes on what you've already done might be counterproductive.