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If you aren't trying to set off car alarms you probably don't need dual 12's.
What kind of music do you listen to?
With subs 6x9's aren't really necessary, you'd be better off with 6 1/2's, they'll sound better, you don't need the added low end that 6x9's will give you.
12 gauge power wire is almost definitely too thin, and 8 gauge is right on the bubble for that power range, you could run just one real thick wire to the trunk and then split it there if you don't want to run two power lines [that's what I did in case I ever want to add a sub]
EDIT:
You're seriously under powering those subs, which is going to lead to clipping from the amp, which is going to lead to overheated and broken speakers
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