I would lose the Soundstream. Have no data indicating it can accept balanced signals.
You seem to be making up your own systems. As has been said before, do what you want. You ask for advice and then change things around, so good luck to you.
I recommended things that I know work. I'm not going to chase every idea you have, though.
I mentioned where the amp goes. The crossovers often go under the trunk floor in the tray. If your installer know your cars you'd be farther along.
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