Can you cite a single case of a libel case in America lost by a defendant, that spoke the truth, on a "technicality"?
Lost? Probably not many, because a lot (if not most) settle before it gets to that point. The problem is that a plaintiff with money can keep you buried under motion after motion, which costs a lot of time to answer, and that's time not spent on your business. Look at how much SCO cost IBM for their little adventure, even though SCO really didn't have any technical merits to their suit and it was mostly just an attempt to increase their share price. Sure, you can try to get the court to deal with a vexatious litigant, but there's no guarantee the judge will see things your way, and again, that's more of your time spent doing stuff that a lawyer could probably deal with more efficiently.
I'm not saying you're wrong for doing things pro se - actually, I admire that you made the effort to do it yourself. Just don't underestimate how much trouble someone with money can make if they really want to cause problems for you.