DMX optical isolators are always a good thing to have around to fix ground loop issues. Also, some low-end LED fixtures are very very finicky about the DMX refresh rate. I use Chauvet TRI-B fixtures and I'm really happy with them but initially I had issues with occasional flickers and flashes. I bought a Doug Fleenor DMX timing regenerator and they're flawless now. Also, as a side benefit if the console goes down it will hold the last frame of DMX data that was active so you're not left in the dark.