Random Car Audio Question? Could Use Some Suggestions?

I am running A set of (older) Boston Acoustics Pro’s for my front stage. 75 RMS to each split off a Memphis M class 4 Channel Amp. I set my head unit EQ to “flat” and set the HPF to around 100-120 hz which is perfect due to the fact that they are only 5″ midrange. I did not use a meter during the duration of “tuning.” I simply set my headunit to around 80% power, set my amp to “flat” and tweaked my gain until it started to distort then backed off a bit. I tried to use the HPF setting but it didnt sound as “full” so I set it to “flat” and that bi-passed all other settings on the amp (boost, etc) Point being…..the tweets realy suck. At “normal” listening levels they sound prestine, but if you crank em’ the midrange sounds amazing, but the tweets are HARSH on the S’s and H’s. You basicaly get a head ache listening after while. Now I know tell me to turn it down, but they still dont sound right. Way too bright! I know they are metal dome tweets, but They are Boston Pro’s! I set them to negative 3 on the crossover which helped a bit, I went and tried turning my treble down a few notches, sounded great at high volumes, but at normal volumes it sounded unbalanced. Everything is in stock position, the woofers are near the floor facing the dome light, the tweets are up by the mirrors in the stock locations.

Any recomendations on how I can get the “brightness” down would be great. Try running them Active?
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