You can swap/reverse the motor direction of your ZTW Black Widows with BLHeliSuite. There is an option „Motor Direction“ that you can switch to „Reversed“. Read my other article on how to do that in detail: BLHeli ArduinoUSBLinker – One-Wire Flashing ESC
Related article: http://www.rcgroups.com/forums/showthread.php?t=2489971&page=3