If I understanding this right, the PST line is an okay scope, if not great, and the Tango 4 is probably made by the same folks and should have an equivalent quality as the PST.
The reason I keep coming back to the Tango 4 is because it has the exact features I'm looking for (including FFP) and I was able to find a tall target test that showed it was absolutely dead on with a 30 MOA adjustment. It was something like 100.0016% variation. That's pretty damn good!
Was this a test done with a single scope?