XLR cable is higher guage and poorly suited for DMX... it just can't handle the data flow. A high quality XLR cable can transmit DMX up to 100 feet, but in most cases your range will top out at about 25 feet. DMX cable is good for almost 2000 feet. On the plus side, DMX is totally fine for audio. Because of this, I've stopped used XLR cable completely, actually. Easier to use one cable for both.
I have a few terminators but have never found that they make any difference at all, even with runs/links over 1000 feet long. It's really odd that you are having issues with unterminated short runs.
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