I see some issues there.
8awg is good for 60A, not 80A. Reduce your amp fuse or run 4awg to each amp.
Don't run front RCA to one sub amp and rear RCA to another sub amp. Either daisy chain the amps or split with a y-adapter. Maintain your fader.
Use larger speaker wire, 12 awg both to the box and inside the box.