Help with Proper Fusing and Grounding.

[SilveradoDeath]

OK, Im going to be running. AQ2200(200amp) 2xAQ120.4 (160Amp Combined) and RF200.2(40Amp) total of 400Amps

I will be running a Kinetik HC2400 Up Front and A Kinetik HC2400 In back. With 2 runs of Knu Kandy kable. 0ga. the wire is rated for a 250amp load @ 20ft. if im running 2 run at about 15ft could i go higher on the fuses or should i run them at 250amps as recommended?

also, if im going to be pulling 400amps between the 4 amps and a plan to run them all into a single Distribution block and the 2nd battery off of that to, is it ok to run 2x 250amp line into the distribution block to give me the 400amps in the back, or do i need to split up the amps?

also im only going o be running a 130amp alt so do i go 1 run or 2 runs between the alt and front battery, if im planning on 2 to the back.

Then on the grounding question should i do to runs for the ground to the front or just ground it to the chassis and frame