Ever install I have heard them in I thought they were a little on the bright side for my taste but I would not call them overly harsh. I have not been a big fan of the DD comps. in any of the vehicles I have heard them in so far but it all personal preference.
Have you checked all your settings in the HU (treble, factory eq) or other settings to ensure you are not boosting a freq. within the pass band the tweeters are playing in.