I am very much looking forward to the answers here. I do not have a lot of experience with and against Circle, but Tharn do not seem to be the turnament boogeyman. Maybe Harbies fault? I think Circle is definetely very competetive, Wurmowood, krueger 2 in Bones / DevHost. Or Baldur. I think between Dev Host and Bones and good handufull of casters, you have good options. Call of the Wild is probably underaprechiated right now. And I would love to play more Tanith.
The real issue is: All the top tier stuff is getting dusty. Top players know what to do against those lists. So like Trolls before Circle is now in need of player getting creative and moving the meta wheel forward!