Addressing just one of your points, Janoshik did his own personal testing for metals in the past and across a wide variety of vendors never found anything so he doesn't offer the test because it doesn't seem to have value. Can safely assume that various metal contamination don't seem to be present in AAS.
In general, no vendor is doing impurity testing for other things, including QSC, other than HGH dimer testing. That testing would cost an additional $80-120 for each contaminant and not enough people are willing to foot that bill for testing labs to do that.
If you are interested in it, right now the best option is to get FDA-approved pharma versions from outfits like Defy Medical / etc. You may also be able to pay for limited additional QA/QC testing yourself from Jan or find other labs which can do this.
