This doesn't sound like a good situation at all. I've never seen a blind curve on any of the mtb trails I've ridden or hiked, but of course I am new and far from an expert. We have a good number of tight switchbacks and other features, but as long as you keep scanning ahead you can see others coming enough to be able to do what you need to do. As a slower rider I just tend to get out of the way of everyone, regardless of direction

Good luck on finding a solution, it sounds like your terrain forced the trail builders into some less than optimum choices.