diff --git a/ferminet/base_config.py b/ferminet/base_config.py
index 00e8552..70d653b 100644
--- a/ferminet/base_config.py
+++ b/ferminet/base_config.py
@@ -53,7 +53,7 @@ def default() -> ml_collections.ConfigDict:
       # importlib.import_module.
       'config_module': __name__,
       'optim': {
-          'objective': 'vmc', # objective type. Either 'vmc' or 'wvmc'
+          'objective': 'vmc', # objective type. Either 'vmc' or 'wqmc'
           'iterations': 1000000,  # number of iterations
           'optimizer': 'kfac',  # one of adam, kfac, lamb, none
           'lr': {
diff --git a/ferminet/configs/atom_test.py b/ferminet/configs/li_wqmc.py
similarity index 97%
rename from ferminet/configs/atom_test.py
rename to ferminet/configs/li_wqmc.py
index 6b5f9c2..3d35d00 100644
--- a/ferminet/configs/atom_test.py
+++ b/ferminet/configs/li_wqmc.py
@@ -64,7 +64,7 @@ def _adjust_nuclear_charge(cfg):
 def get_config():
   """Returns config for running generic atoms with qmc."""
   cfg = base_config.default()
-  cfg.system.atom = ''
+  cfg.system.atom = 'Li'
   cfg.system.charge = 0
   cfg.system.delta_charge = 0.0
   cfg.system.spin_polarisation = ml_collections.FieldReference(
@@ -78,4 +78,5 @@ def get_config():
   cfg.optim.clip_median = True
   cfg.debug.deterministic = True
   cfg.optim.kfac.norm_constraint = 1e-3
+  cfg.optim.objective = 'wqmc'
   return cfg
diff --git a/ferminet/hamiltonian.py b/ferminet/hamiltonian.py
index 448bfaa..a7257d7 100644
--- a/ferminet/hamiltonian.py
+++ b/ferminet/hamiltonian.py
@@ -174,25 +174,25 @@ def potential_nuclear_nuclear(charges: Array, atoms: Array) -> jnp.ndarray:
     charges: Shape (natoms). Nuclear charges of the atoms.
     atoms: Shape (natoms, ndim). Positions of the atoms.
   """
-  natoms = atoms.shape[0]
-  r_aa = jnp.sqrt(jnp.sum((atoms[None, ...] - atoms[:, None] + 
-      jnp.eye(natoms)[..., None])**2, axis=-1))
+  r_aa = jnp.linalg.norm(atoms[None, ...] - atoms[:, None], axis=-1)
   return jnp.sum(
       jnp.triu((charges[None, ...] * charges[..., None]) / r_aa, k=1))
 
 
-def potential_energy(r_ae: Array, pos: Array, atoms: Array,
+def potential_energy(r_ae: Array, r_ee: Array, atoms: Array,
                      charges: Array) -> jnp.ndarray:
   """Returns the potential energy for this electron configuration.
 
   Args:
     r_ae: Shape (nelectrons, natoms). r_ae[i, j] gives the distance between
       electron i and atom j.
-    pos: Shape (neletrons, ndim). Electron positions.
+    r_ee: Shape (neletrons, nelectrons, :). r_ee[i,j,0] gives the distance
+      between electrons i and j. Other elements in the final axes are not
+      required.
     atoms: Shape (natoms, ndim). Positions of the atoms.
     charges: Shape (natoms). Nuclear charges of the atoms.
   """
-  return (potential_electron_electron(pos) +
+  return (potential_electron_electron(r_ee) +
           potential_electron_nuclear(charges, r_ae) +
           potential_nuclear_nuclear(charges, atoms))
 
diff --git a/ferminet/loss.py b/ferminet/loss.py
index 884b60e..df6c2b9 100644
--- a/ferminet/loss.py
+++ b/ferminet/loss.py
@@ -258,13 +258,13 @@ def total_energy_jvp(primals, tangents):  # pylint: disable=unused-variable
   return total_energy
 
 
-def make_wvmc_loss(network: networks.LogFermiNetLike,
+def make_wqmc_loss(network: networks.LogFermiNetLike,
                    local_energy: hamiltonian.LocalEnergy,
                    clip_local_energy: float = 0.0,
                    clip_from_median: bool = True,
                    center_at_clipped_energy: bool = True,
                    complex_output: bool = False) -> LossFn:
-  """Creates the loss function, including custom gradients.
+  """Creates the WQMC loss function, including custom gradients.
 
   Args:
     network: callable which evaluates the log of the magnitude of the
@@ -362,7 +362,7 @@ def log_q(_params, _pos, _spins, _atoms, _charges):
       return out.sum()
 
     score = jax.grad(log_q, argnums=1)
-    primals = (primals[0], data.positions, data.spins, data.atoms, data.charges)
+    primals = (params, data.positions, data.spins, data.atoms, data.charges)
     tangents = (
         tangents[0],
         tangents[2].positions,
diff --git a/ferminet/train.py b/ferminet/train.py
index a90321b..a260ba7 100644
--- a/ferminet/train.py
+++ b/ferminet/train.py
@@ -580,8 +580,8 @@ def log_network(*args, **kwargs):
         center_at_clipped_energy=cfg.optim.center_at_clip,
         complex_output=cfg.network.get('complex', False)
     )
-  elif cfg.optim.objective == 'wvmc':
-    evaluate_loss = qmc_loss_functions.make_wvmc_loss(
+  elif cfg.optim.objective == 'wqmc':
+    evaluate_loss = qmc_loss_functions.make_wqmc_loss(
         log_network if cfg.network.get('complex', False) else logabs_network,
         local_energy,
         clip_local_energy=cfg.optim.clip_local_energy,