Each batch is different with TRRC cuz "They don't Test Chemicals unless they come from a Source that is not trusted." is what I was told which is an honest one and I respect that. I was told by a Member that his current batch of 6-@-P-B was good. I got On3 Gr@m of it and it was great for the amount I Researched especially the Succinate Version.
That being said I suggest just asking TRRC if his current batch is good or not "as you've got conflicting reports" (is what I'd say when asking this question with him first." and "your wondering if you should wait for his next batch and if this one is low purity possibly thank you?" that is what I would say.
That is just my opinion as he is the only place I trust enough at the moment in this market. He is the only one with Five-M-@-P-B also.