@Photon not arguing you, just known of him since he 1st showed up and do time from time have these conversations with him privately.
I'll always follow something like this with him tagged for him to correct me if I'm wrong and if correct help the rest of us.
I got some tren e off QSC 1 week before they left that tested 87.93%, he found 9% moisture in it. So beside wondering about the impurities, find out if it's moisture also.
They can be rushing through the drying process leaving moisture behind that is costing us the drop in purity as well. This had been the main issue with tren a for decades but never tren e.
I had never seen in over 15 years tren e that low, nor Jano, it was the beginning of lower purity last year. Moisture was the issue with that batch.