The JST connectors are rated at 9 Amp maximum...so guess what. Your ESC's are gonna fry your JST's. Here is some good reading about connectors and their AMP rating:
http://www.icare-rc.com/connectors.htm
Apart from that, you would need to consider 2 things:
1) For JST connectors you need some specialized tools and some experience to do it properly (apart from the fact that this connector is useless for you)
2) Try to avoid - if possible - to use ANY connectors at all. Connectors - nevermind how good they - are always a source for failure. IF you have no other choice than to use connectors, make sure they are soldered properly (if you are not experienced, get somebody to do it for you).....NO CRIMPING ANY CONNECTORS, ALWAY SOLDER THEM
Plan your layout carefully in order to avoid cables being too long or too short. Once your connectors are plugged ogether, put a piece of heatshrink tube over the connection and heat it. In that way the connectors connot come apart from vibration.
I just would like to see a PDU with JST connectors...that must be a toy.
Chris