I need some advice on my manifold. I used the Dura manifold. My problem is that there is too much lateral pressure and the plastic threads on the left side of the Dura are leaking. I tried to retape and tighten, but the threads pop loose and the leak is worse now. Any suggestions as to how best to do this? The main is 1 1/4" poly. I'm thinking about scraping the Dura manifold and going PVC. Is that the preferred way? The valves are threaded. Also, should I throw couple of 90's on each end of the manifold so that the manifold isn't directly inline with the main? I attached a couple of pictures. The pump side is the right side of the manifold; the left side continues to another manifold in the front yard. Any other advice would be appreciated. Thanks.