There is a whole lot I don't like about how you did that, but I'm not a plumber, so to each their own. Why so much galvanized piping? I would have switched to a brass shutoff valve at the main, then used a dielectric union ontop of that to go to all copper. And you installed a PR, but didn't install gauges to check to see if its working. also, what made you think your pressure was too high?