Need some bec wiring and voltage advice please look and help me out

[ssdub33]

Here is a current diagram of the way my truck is going to be setup when my rear winch arrives PLEASE SEE BELOW PICTURE FOR WHAT I NEED ADVICE ON

I am wondering if I need to upgrade to a bec pro to get full voltage to both my steering servo and winches. My current castle bec is set at 6.4V and is plugged into a y servo cable with my steering servo and goes into my rx. The new warn rc4wd winches use a different control unit then the older winches and do not have a seperate power supply. The new winch controller is powered from the rx. I have a heyok winch toggle switch coming so I can use one winch controller for 2 winches and just flip the switch to select front or rear. I am trying to decide if I should get a castle bec pro because they have 2 power outputs instead of one. So what I am thinking is that I could do something similar to what I have done with my current bec and use a y cable for ouput 1 and plugging it into the y cable and then the other plug is my steering servo then to the rx. Then output 2 of the bec again with a y connected to my winch control unit and then to the rx. I would just appreciate the help so I make sure to get enough voltage to everything since currently my winch servo is a little slow due to being powered through the receiver. My servo is a hitec 7954SH and my servo winch is a hitec 645mg with the circuit board and pot adjuster removed that is powered and controlled by a winch controller.