Looking at the "unmastered version", you have clipping happening on it to begin with. Look at 01:41.565 to 01:41.587.
This clipped first beat tells me you are using compression on the 2buss which is squeezing the life out of the track.
Take the 2buss compressor off of the mix and re eq your 2mix to get your clarity back.
Then you will have something that will have a better "shot" at mastering.
I did a "search, destroy, repair, and help" quicky mastering pass on the unmastered version but I would like to see it go down to 2mix print "cleaner" myself.
Do a revisit and then you can have a better sounding track. To make this track "what it could be" requires more work. Your mastered version was unacceptible to me.
This is a screenshot of the utter clippage of your mastered version......