Update:
Although the changes I made were an improvement, I still wasn't completely satisfied. Still wanted more mids, less highs, and less lows, so I replaced C12 with a .022uf cap (original is 0.1uf), changed R14 again from the 3.3k to a 4.7k ohm, and changed R16 from the 6.6k ohm to a 3.3k...