I risk being ostracized for this, but I strongly believe sending a few blind samples with a known concentration to SIMEC would help clearing this up.
From an analytical standpoint a trend like this would raise an eyebrow and get people looking for a systematic error. That's as neutral statement as I can make and I ain't trying to throw dirt here.
These samples were tested awhile back
Primo of The Gods (source) and I did the "experiment" using his Raws (APIs)
These 2 samples were tested by an accredited lab (LC/MS/MS)
Raw Powder and Finished Oil
POTG had the same finished oil (batch) tested by SIMEC also
The results were similar (he has that assay)
But AnabolicLab results using SIMEC have been similar
Primo of the Gods Primobolan Enanthate Lab Test Results - Anabolic Lab