diff --git a/dependencies.yaml b/dependencies.yaml
index 8455aefc4..b075ac093 100644
--- a/dependencies.yaml
+++ b/dependencies.yaml
@@ -30,8 +30,8 @@ lfric_apps:
     ref:
 
 lfric_core:
-    source: git@github.com:MetOffice/lfric_core.git
-    ref: 2026.03.1
+    source: git@github.com:cjohnson-pi/lfric_core.git
+    ref: stretching
 
 moci:
     source: git@github.com:MetOffice/moci.git
diff --git a/rose-stem/app/gungho_model/opt/rose-app-robert-moist-lam.conf b/rose-stem/app/gungho_model/opt/rose-app-robert-moist-lam.conf
index 436275a25..0505b2ef5 100644
--- a/rose-stem/app/gungho_model/opt/rose-app-robert-moist-lam.conf
+++ b/rose-stem/app/gungho_model/opt/rose-app-robert-moist-lam.conf
@@ -9,7 +9,7 @@ boundary_e=2
 boundary_n=0
 boundary_s=0
 boundary_w=2
-edge_cells_ew=50
+edge_cells_ew=100
 edge_cells_ns=8
 inner_width_ew=0
 lbc_eos_height=100
diff --git a/science/gungho/source/kernel/limited_area/create_w2mask_tang_kernel_mod.F90 b/science/gungho/source/kernel/limited_area/create_w2mask_tang_kernel_mod.F90
index 56c7e0723..c4da24414 100644
--- a/science/gungho/source/kernel/limited_area/create_w2mask_tang_kernel_mod.F90
+++ b/science/gungho/source/kernel/limited_area/create_w2mask_tang_kernel_mod.F90
@@ -147,7 +147,7 @@ subroutine create_w2mask_tang_code( nlayers,      &
                                             query_value_ns, &
                                             query_value_ew, &
                                             mask_value
-  real(kind=r_def), parameter            :: tol = 1.0e-9_r_def
+  real(kind=r_def), parameter            :: tol = 1.0e-15_r_def
   logical(kind=l_def)                    :: ew_innerbox, &
                                             ns_innerbox, &
                                             ew_outerbox, &