That seems like a lot of equipment you have there. One main problem that I do not see that you have addressed is the alternator. Have you changed that to a higher amperage output one yet? I have a 2000 accord with a system that puts out about 1500 watts constantly and the first thing that I did was swap the stock alternator with a high output 160 amp alternator and get a yellowtop battery. From what I know, stock 2006 Accord alternators put out about 80-90 amps, which is way to low for your application. Try to find an aftermarket high ouput alternator (some shops can even respool it for higher amperage).