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Uhhhhhhhh, it may be something obvious that you missed. Everything that is in the vacuum system but not the brake booster is behind a restrictor, which means your main vacuum line is either cracked and leaking or leaking in some other way.
It could also be a bad vacuum pump, but because this problem appeared right after that replacement, I don't think so.
Plug the brake booster end of the main line and try to find any obvious leaks. Then try to use a mityvac on one of the ports (clog the other one) and see if it's holding vac with the car running.
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