Almost all of my orders are international - but here's what I can say from my experience in what I've seen from the domestic lines...
I have ran some dome test cyp 20ml jugs that were great - this was from an order back in January - I've also given some to my brother as a gift and he has seen very good results as well - same batch.
Several months a go I ran some test e that was being tested as a new dome line and it was one of the best lines I have ran - however I don't know if this line was ever used on the site - but for me it was awesome - except I told Z I didn't care for the labels ... "I'm just picky - but the test was great!"
I did hear of a concern about the domestic line just after it opened back up a couple months ago - so, I requested an order of "that" test - along with the new Euro test being introduced to the domestic line to compare the two.
Fome those, in both the older and newer line - I did see very good results with both - so I really don't know if that was an isolated situation - but for me I was very happy with all of them.
I've become good friends with Z - and he knows I would not keep quiet if I seen a problem - when he asked me to test the line of domestic several months ago - he wanted my honest opinion on the line before introducing it to all his customers - this is something he does on different levels to make sue everything is at an A+ quality level before it's released.
... so I told him the test was freaking awesome, but the labels kind of sucked!
It's hard for me to know for sure with out knowing your the details?
Five weeks should start kicking in by now - but my guess is you have some experience or you would not be running at those levels.
I would jump into the Euro line and see how you respond - if it's the same as I have ran I know it is really good - I hope this helps a little?
Please keep us posted I know Z wants all customers to be happy.