The default config was slightly changed, you can see the changes here: https://github.com/Olexorus/WitherAC/commit/f9c75d439fd18f023f2c96e2e2dc95ea21ea56f3

Changelog v0.19.0:
- WAC can now accurately model movements in water and check for speed hacks properly
- this should also fix some false positives, for example when combining depth strider and dolphins grace or item attributes
- changed the logic of the speed check a bit in general to hopefully make it more relieable
- made the build angle check more lenient to reduce false positives when lagging
- increased the default config value for the packet speed check
- removed a small part of the api which wasn't used by anyone to my knowledge (and not even documented yet), I plan to extend the api in the future