I doubt that you will find any Universiy "chemist" willing to go to bat for you. From what I read a place like Walmart has each batch/lot of pharmaceutical that they purchase analyzed. They also have it re-analyzed at a later time.

There is a code on each tablet or capsule that identifies it. You should make a note of that before it could be subject to destructive testing. Or find a way to get more of them.
Could be the first pharmacy was giving you the right thing, but also seems like pharmacy #2 is giving you something that's way too strong. I'd be after the second pharmacy first if I was you and then call your doctor to ask if that strength would be right for you. IMO what you found doesn't automatically indict the first pharmacy as being wrong since you were getting good BP numbers while on their medication source.

Seems like the one that went bankrupt was giving you a better med than the new one.