Thanks for your help.
Here is what I came up with to relive the backpressure. It is about 2' 3/4 Pvc then a clear piece of hose then the 1/2 Pex. I just tested it and it all seems to be good now.
I put a 4” piece of clear hose between the PVC and the Pex so I can see if it gets backedup.
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