I think THC/THCA results are misleading. Cannabis is way more complicated than to isolate it to one chemical for potency. there is the entourage effect. Look at ZkittleZ for 2106 it doesn't go past 20%.
This is the GSC Forum Cut I had tested.. I never had a problem with these flowers. Remember, this is from a random sample but I think this represents the lower end of FGSC. I ran it in SOG to get the best out of it, golf ball sized flowers all day long. I have moved to other cuts, and culled that cut from the garden. I would rather run PGSC, or Birthday Cake if i'm doing GSC cultivars.
http://analytical360.com/m/archived/256771