My 9920 is wired pretty much the same way. I only used 2 sets of deans to wire mine.You can shorten up your wires by getting rid of the connector on the esc wires. Take that connector out of line and run the esc wires to the male dean that comes off theother sideof the battery connector. Still a Y but not completely removeable. You only need to disconnect one battery plug as this cuts the circuit to the ESC. This will help shorten the wires about 1 1/2in on your setup. Run an
UBEC to help take some of the load off of your ESC.