tweeter to shrill, 13er sounds funny

Tomorrow, tomorrow I have now finished my 13s heart and the as20 tweeters installed in my bmw. unfortunately the tweeters in the mirror triangle sound a bit too shrill for me. if I hear an adapted loudness it sounds great from the tweeters but as soon as I make louder they scream right. what can I do against it? I left the foam insert around the tweeters away. should I mount it again or bring the nothing? another problem are the heart hv130. with adjusted loudness you hear yourself well but with certain songs I have the impression as if certain sounds or frequencies sound like through a megaphone. is difficult to describe. quite dull and somehow funnel-like. can I do something against it. I have around the installation place so ne approx. 2cm high tube where the ls is normally sitting on it. since original 13ers are in but now 13ers are installed the ls in this tube but not quite at the front of the protective grid from the door dress ung. what can I do against the effect. everything is operated by an audiosystem f4-240. before I had 13s of audiosystem inside and they didn’t sound like that. the tweeters were however from cervin-vega. so, can someone tell me how to fix these problems? thank you already. gruß mitze