Just get back on the horse and try again. I failed the VCAP-DTA a couple weeks ago by about the same score, and I do View deployments for a living. It happens to all of us.
Honestly just be really comfortable with the source material to the point where you can make snap answers correctly. Do a quick 30 second sanity check if the question isn't obvious and move on. That way if you get stumped by something out of the blue you can spend some time on it.
But if you can't solve a question in 5 minutes, you probably can't solve it and should just make a educated guess.
Try not to feel too down about it, I failed with like a 284 or something my first time, after submitting my final answer with less than 30 seconds on the clock. Knowing what I was getting myself into, I turned bookworm for a bit and nailed it a week later with a respectable score. VMware is pretty infamous for making their cert tests quite "curveball-ish", and even after living and breathing the blueprint forward and backwards, the depth of some of the questions will still feel like they came way out of left field. A great many people fail them on their first go-around. On one hand, it doesn't really feel fair, but on the other, it means the certifications should actually mean something.
The VCAP exams are definitely no easier...
Probably the worst cert test I've taken. It's all bizarre non real world scenarios and trick questions. Sounds like you know your stuff though - give it another shot!!