I'm having the same issue. All servers tagged Blackwonder US have latency in the mid 200s for me, and I live in Atlanta. In comparison,
MIA servers are around 30.
NY servers are around 40.
TX servers are around 30.
LA servers are around 60.
UK servers are around 110.
The lone AUS server has a ping of 242.
The unmarked Blackwonder servers are around 120.
Something really weird is going on with the server host. I have not really seen any responses from moderators on discord who either a) ignore it or b) say it is simply the issue of the person with the high latency. In the discord, I have seen users Sammers, est, Michael Blackson, iwannfly, poopyjoe, Carl_116, and perhaps Ashai complain about the high latency. I sincerely doubt that it is the users who have the issue - or at least me - since I am still able to connect to servers which have the appropriate amount of latency for their distance from me.
Manager Robbwonder.tf replied to a ping regarding this issue, stating that he may "wander into the server rooms and nicely ask the rack to be better" which is the closest we have gotten to any sort of tangible response which is still incredibly dismissive. I would love for you guys to actually get in contact with the people hosting the Blackwonder US servers and see if there is any problem on their side which could be affecting latency to players, because they might as well be hosting from the other side of the world.
Included are screenshots to demonstrate my point. I do not have abnormal latency with any other server group than Blackwonder US.
Blackwonder US is home to servers unique to the group's ecosystem such as Super Zombie Fortress, Jailbreak, the Duel server, Wave Dodgeball, and Medic vs. Engineer. It is not possible for me, the other users, and however many more silent players to be able to enjoy these servers. I would greatly appreciate a response from the team.