diff --git a/config/model_configs/diagnostic_edmfx_bomex_box.yml b/config/model_configs/diagnostic_edmfx_bomex_box.yml
index a3a2fd4303..8753b82091 100644
--- a/config/model_configs/diagnostic_edmfx_bomex_box.yml
+++ b/config/model_configs/diagnostic_edmfx_bomex_box.yml
@@ -16,15 +16,15 @@ edmfx_sgs_diffusive_flux: true
 moist: "equil"
 config: "box" 
 hyperdiff: "true" 
-kappa_4: 1e12
-x_max: 1e5 
-y_max: 1e5 
+kappa_4: 1e21
+x_max: 1e8 
+y_max: 1e8 
 x_elem: 2 
 y_elem: 2 
 z_elem: 60 
 z_max: 3e3 
 z_stretch: false
-dt: "10secs" 
+dt: "50secs" 
 t_end: "6hours" 
 dt_save_to_disk: "10mins"
 toml: [toml/diagnostic_edmfx_box.toml]
diff --git a/config/model_configs/diagnostic_edmfx_bomex_stretched_box.yml b/config/model_configs/diagnostic_edmfx_bomex_stretched_box.yml
index edb576ea23..a469e26666 100644
--- a/config/model_configs/diagnostic_edmfx_bomex_stretched_box.yml
+++ b/config/model_configs/diagnostic_edmfx_bomex_stretched_box.yml
@@ -25,7 +25,7 @@ z_elem: 30
 z_max: 3e3 
 dz_bottom: 50.0
 dz_top: 200.0
-dt: "10secs" 
+dt: "50secs" 
 t_end: "6hours" 
 dt_save_to_disk: "10mins"
 toml: [toml/diagnostic_edmfx_box.toml]
diff --git a/config/model_configs/diagnostic_edmfx_dycoms_rf01_box.yml b/config/model_configs/diagnostic_edmfx_dycoms_rf01_box.yml
index bcca068b72..c875dfaa7a 100644
--- a/config/model_configs/diagnostic_edmfx_dycoms_rf01_box.yml
+++ b/config/model_configs/diagnostic_edmfx_dycoms_rf01_box.yml
@@ -15,15 +15,15 @@ edmfx_sgs_diffusive_flux: true
 moist: equil
 config: box 
 hyperdiff: "true" 
-kappa_4: 1e12
-x_max: 1e5 
-y_max: 1e5 
+kappa_4: 1e21
+x_max: 1e8 
+y_max: 1e8 
 x_elem: 2 
 y_elem: 2 
 z_elem: 30 
 z_max: 1500 
 z_stretch: false
-dt: 10secs 
+dt: 40secs 
 t_end: 4hours 
 dt_save_to_disk: 2mins
 toml: [toml/diagnostic_edmfx_box.toml]
diff --git a/config/model_configs/diagnostic_edmfx_gabls_box.yml b/config/model_configs/diagnostic_edmfx_gabls_box.yml
index e96b729eef..864cff562b 100644
--- a/config/model_configs/diagnostic_edmfx_gabls_box.yml
+++ b/config/model_configs/diagnostic_edmfx_gabls_box.yml
@@ -13,15 +13,15 @@ edmfx_sgs_diffusive_flux: true
 moist: equil
 config: box
 hyperdiff: "true"
-kappa_4: 1e12
-x_max: 1e5
-y_max: 1e5
+kappa_4: 1e21
+x_max: 1e8
+y_max: 1e8
 x_elem: 2
 y_elem: 2
 z_elem: 8
 z_max: 400
 z_stretch: false
-dt: 10secs
+dt: 200secs
 t_end: 9hours
 dt_save_to_disk: 10mins
 toml: [toml/diagnostic_edmfx_box.toml]