It was early January batch. You can see some thick rubber pieces on top right corner and bottom, there are more smaller ones inside.
First time i draw more than 20 times from same vial. Your other vials around 15 times, were fine.
20G is pretty much standard for drawing.
With what needle gauge did you test them and how many times did it last?
Is it possible that this Tren batch has different/bad quality rubber?
Most of times i was trying to keep some distance. But at some point its inevitable that you 'll not go close.
I also had it before from other lab, but it was a known issue from them. Rubber was dropping in after first use.