The popular Upper Hand

[The_Metallurgist]

The only thing I sense is a very slight "tubbiness" in the low mids - maybe somewhere around the 300hz mark - probably a little tweak on the master buss eq would nix it.

a nix on the master buss will take out some warmth and give a sense of a brighter top end - adjusting one part of a spectrum affects another somewhere else, kind of thing, as happens when messing with the master buss.

could you be more specific regarding "when" the tubbiness is being experienced, because this will define the necessary corrective actions? it could be an accumulative effect of certain instruments at that point....and this also brings in the question of whether dipping the master buss would be best served on the mid or side channel. but hitting ~300 is going to affect the vocal if the EQ is simply a stereo job, and the vocal is king here...Dave's done a nice job fixing this quite problematic 'instrument', hey. fixing one problem can and will often create another somewhere else when tweaking the master buss. such are the joys of Mastering

could the problem be better served with dynamic EQ...or static, for example?

these specifics are important. fully agree that reverbs are a common problem because they hang around longer than the note....and create build ups especially when two or more instruments are playing in close spectral proximity.... fundamental-wise, or within the early harmonics.

this also raises a little question....as to whether you've spotted the tubbiness in a spectral analyser....or your listening environment. if the latter, how well controlled is your room?

now the fun starts