Use 1-1-1 for the linear step

src/one-body-sample.parset

@@ -25,9 +25,9 @@ maxiterations = 1000000
 tolerance = 1e-12
 
 [solver.tnnmg.linear]
-nu1 = 3
+nu1 = 1
 mu = 1
-nu2 = 3
+nu2 = 1
 
 [solver.tnnmg.main]
 # The canonical choice is 3-1-3. Since the nonlinear step is by far