To aid you with finding the parameters, argon2_cffi offers a CLI interface that can be accessed using python -m argon2. It will benchmark Argon2’s password verification in the current environment. You can use command line arguments to set hashing parameters:

$ python -m argon2
Running Argon2id 100 times with:
hash_len: 16 bytes
memory_cost: 102400 KiB
parallelism: 8 threads
time_cost: 2 iterations


45.3ms per password verification

This should make it much easier to determine the right parameters for your use case and your environment.