I don't think you can blame Pro Systems for that problem. They don't cast/manufacture the parts, rather purchase from an outside source which I assume is Holley.
I've have used Patrick since the mid 90's, probably longer than most here on the net (owning 4 carbs of his so far). He has always been quite helpful, so it's only fair to bring up the issue with him and see what he says and is willing to do.
Buddy of mine had a Holley 750 vacuum secondary he bought brand new. Ran it for one season bracket racing (gas) and took it apart to find the bowls VERY corroded. He called Holley and they admitted they had a batch that had problems with the aluminum/zinc and replaced it with a new one free of charge.
You gotta give the build a chance to provide you customer support before you fly off the handle and approach others for a fix.
At least that is how I would handle this situation.