With the radio levels in East Central Scotland, I use these settings:

[hijack]
disable_bassboost_FM=1
volume_boost_FM=1
volume_boost_AM=-2

Sorts things out pretty well. I don't use AUX for anything either so no info on that.
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock