I'll just repeat Paul's advice Sonja. I followed his advice and it worked for me.
Reduce the amount of oils in your batch to 80%, then add to that 80% of the oils weight in salt. The salt added to the oils increases the volume of your pour, so if you make your standard batch size it will overflow your mold. Paul has said his experience is that 80% of the weight of oils in salt is better than using the equal weight that some people strive for. The 80% salting worked well for me.
My experience, and that of others as indicated in their posts, is that salt seems to accelerate the curing quite a bit, and they say that you should unmold and cut as quickly as possible. My experience bears this out. Wait too long and your bars will partly crumble as you try to cut them.
I suspect that using a pipe mold for salt bars is probably not the greatest idea. I advise you should stick to some mold that is more resistant to stuck logs. I use a rectangular mold with removable sides and line it with freezer paper.