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nice work man! simple fix to that is to chuck a 47uF capacitor on the output of the bluetooth audio, should get rid of your noise :)
In the series-parallel you state that it will drain your batteries fast.. as far as I'm aware it will actually increase the capacity of the batteries while also increasing the voltage at the same time.
Hey man, the reason you have such a low battery life is because you are using 140W speakers which are incredibly more powerful than the ones used in the instructable! the ones used in the instructable are only 3W. The only way to get longer battery life would to either get more batteries or replace the amp and speakers to ones that are lower wattage. hope that helped a little :)
try aliexpress, they have tons of cheap bluetooth modules :)
you can literally use any module that supports A2DP/AVRCP
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