If there is absolutely no way to avoid this hanky-janky section of plumbing, perhaps by changing one end or the other of the run to avoid it altogether...well, I am uncertain with all the squiggles and lines as to what is happening, but you want to minimize the number of bends and angles. Each change in direction drastically reduces flow.
Three 90's aren't needed; you can use just two, and "roll" the offset the required amount to clear the 2x8. Better still, you can make the offset longer and use a pair of 45's or even 30's to achieve the same effect. Using a pair of 45's means that you have introduced the equivalent of only a single 90-degree bend in the plumbing, which will minimize the loss of flow. Using 30's will be even better, but of course the shallower the angle you choose, the longer the offset needs to be.
I notice in the background you've been pretty liberal with your use of the inherent flexibility of PVC pipe in that piece running along the wall/ceiling angle. It dips down a fair few inches as it runs along the wall, and then after the 90 in the corner, as it approaches towards the camera, that run also appears to be bending downwards. Stuff like that isn't pretty, but let's face it: that ship has sailed. In terms of water flow it's way better than handfuls of bends; much easier to do, too. Why not just continue that loosy-goosy plumbing style with your new project?
You should also have a standoff of some sort between the U-bracket and the wood, to take up the inevitable gap that is created when you place the bracket right next to a junction.
I am running PVC on my ceiling. The pipe takes a 90 degree turn and needs to dip 2.75 inches so i can use a bracket to attach it to a piece of 2x8 and then runs to a manifold. How would you plumb the dip so i can place the bracket and line it up with the manifold?
