I'm with you here Sobert. I think the only out-of-balance part of the equation is that Stones of Sturdiness are actually overpowered for a 55 - 70 zone. Perhaps the solution to the problem (which is not a severe problem, truth be told) is just to add the stone to a zone or two a tier ahead. Maybe Fungus grove? That is an underused zone.
The only other aug suggestion i'd have is maybe adjust up the stats on the Fear dropped slot 16 augs to be more in line with VP slot 16's. As they are now, they really have no reason to exist (the clover one and the whiskey one, etc). If you did adjust them up, though, you'd probably have to lower the drop rate, but I don't think anyone would have a problem with that.