Honestly, trust your ear and make EQ sweeps to find what works and what doesn't. To sweep, set a very narrow Q on a frequency band and boost this by a lot. You want to then sweep across the frequency spectrum taking note of which frequencies really jump out as being terrible. Keep in mind, most frequencies will sound terrible when boosting this much, but through practice, you'll begin to identify the more offending ones. Once you find these, go back and make cuts. Always toggle the EQ on and off and compare between the two.