I loaded your MP3 and in my estimation... taming at 104Hz with a fairly narrow Q made a significant improvement. I also tried a bit of compression below 200Hz and that smoothed also, but I stay away from MB compression on the Stereo Buss. I'd back up stream and fix it there.
If you get up and walk around while playing your song and bass starts popping out or going away in different locations then you have room modal issues that need attention. I bet you do. You can't get rid of all of them but they can be smoothed. If your room dimensions are on some level multiples (e.g 12X10X8, 16x8x12 ) , then your room really needs treating. Regardless, it still needs some bass traps.
kp-