If you're having problems with the basic connectors that in the Kit of Parts, Anderson connectors aren't going to help you much.
Learning how to correctly crimp, then solder, then heat shrink those wires is going to be your best bet.
Step 1 is to buy a decent crimp. They're only about $20.
Step two is to teach your electrical team the pull test. Crimp, then pull. Not gently either. If you can pull it apart after you've crimped it, you aren't doing it right.
As another added level of security, solder the wire. Be careful if you have female terminals: you can accidentally fill them with solder so the male terminal can't be inserted.
Finally, heat shrink them. We use heat shrink with internal glue to add one last final layer of security.
Crimping PWM wires is another story. There are both right and wrong ways to crimp wires - there are many useful guides on the net:
Here's a equivalent-to-PWM guide:
http://www.gorobotics.net/articles/m...mp-connectors/
This is just one example:
http://www.tpub.com/neets/book4/12f.htm