So looking at those Polymax bullets, I was thinking of putting the females on the batteries and males for the ESC and parallel harness. I put some heavy duty heat shrink that is 1 mm thick and has hot glue in it. I shrinked a female and male connector and I think it looks good. The heat shrink also comes in red so the connectors would color coded. The beauty of this heat shrink is that it has a high grip rubber feel to it so I can disconnect the bullets with my fingers even without wires on it which solves the problem of disconnecting by yanking on the wires. I'm just tinkering with them because I still don't feel like redoing all my connections