start by determining the offending frequencies by using a very hi Q (narrow BW) with about 10db of gain. run through the frequencies 5-11k. the offending frequencies will really stand out. note these.
i bet they're somewhere around 5k, 9k, and 11k.
then start by cutting at the offending frequencies. don't get fooled by the change in sonic character after you immediately cut. don't under do it because it just doesn't sound bright enough, but don't over do it either.
i like to start with cuts of 2-3db with a fairly low Q (wide BW). others like to do just the opposite, start with a hi-Q and deep cut. after you've settled in, then come back the next day or later the same day and listen again. do this several times, and you'll get there. once you've settled in, note the settings and then raise the Q (narrow the BW) of each and do this again, assuming you started with a low Q. just don't get carried away.
don't be afraid to retreat to previous settings.
-kp-