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I say your issue is that your entire wiring isnt at least 4AWG
I run a 2000rms system with nothing but 4AWG and I never drop below 12.2V at high volume
Dude upgrade that wire. not only is that not safe but your destroying your amps.Give them lots of Clean power and don't make them work for it. your amps will run way more efficient and produce a much cleaner sound and last longer.
you need 0 gauge for sure. 4gauge is good till about 1000 watts RMS.