I now completely dumped auto settings, not even auto TA. But I found the auto gain is useful though, so I can check it against my amp's setting to get best S/N ratio.
My current setup is all 6dB/octave. Sub at 100@6, mid 100@6, 4000@6, tweeter 4000@6. My car sound exceptionally harsh in 2000-4000 range (verified with individual tone) so I let the woofers roll-off and then tweeter take over, to minimize use of EQ. I align each driver by playing tones at the crossover frequency. Fun to hear the noise going around my head when increasing/decreasing length.
I have always worried that 4000/6 is a little too dangerous so I've never use it before. But several days have passed my tweeters (Dynaudio MD102) are still good. And I feel that 1st order filter actually minimizes phase change and is very smooth compared to 18 or 24. My subwoofer doesn't have a spike now around 63Hz, as it would happen if I use 100@24.
Any comment on my set up is appreciated.