There has to be an issue with the plumbing somewhere. Just double check the lower port side of things, and make sure there are no leaks/kinks. That is about the only way you will overboost.
What colour springs did you put in the gates?
The best way to test it all, is to disconnect the lines on the top half of the gates, and leave them open to atmosphere. With this, you should see close to spring pressure boost levels.
If you are seeing anything higher, this is the area you need to focus on.
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