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With these oem setups, isn't a lot of the low and high pass filtering and tweaking of the equalizer (other than the dummy one they give you access to in the head unit) mainly handled by the oem amp.
It seems unlikely you'll be able to correct what you believe is wrong with the Bose system without replacing the stock amp so you have full control over the various channels and can undue the Bose speaker specific modification they are using since you are no longer using bose speakers.
if i were going to modify the audio system, replacing the amp would be first before replacing any speakers. Then I'd be able to correct the bias they have for front speakers and start from a clean state that I have full control over as far as filter sand sensitivies and bass boosting. etc.
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