Well, have the bar owner upgrade the cabling. Rapco makes some decent wiring, although it's not one of my favorite brands. But if it's mic cable, it's not rated for lights. One of my ongoing complaints with DMX is that some fixtures use the 3-pin connection(most of mine does) and it's wired the same as XLR, which only aids to the confusion. Just go with ADJ/Elation Accucable, you can get it in bulk too, or rather the bar owner should. XLR cabling can cause some problems especially in terms of reliability. It's not that expensive either, premade or in bulk. You don't need the Belden 814 110-ohm stuff with Neutrik connectors. Not worth the money.
Sounds like you should set the controller back to "factory reset defaults" and start from there. I find it difficult to try to "reverse engineer" someone else's non-documented work.
I sure hope you're getting paid for this!