I just ran through the Dark Tunnels area with the roots (where the dusk ogres are) west of Riverhaven, and even though I got caught, athletics didn't move off clear.
With 29 ranks, I'm getting 9 to 15 second RTs.
With 62 ranks, I'm getting 5 to 13 second RTs.
With 160ish, I'm not getting caught at all.

With 29 athletics:
Mud north of Dirge: 3 sec RT, no exp, climbing the rockslide gives about 1 full mindstate though.
Mud along the Northwall trail near Crossing is the same story.
Mud on Old Crank's Road on the way to Ilaya Taipa teaches, but seems easier than before.

Is Fang Cove even present in test? I'm standing on the beach waiting for the mammoth to show up to look at the roots over there and it doesn't look like it's coming.