diff --git a/tests/tests/gnv1_nested b/tests/tests/gnv1_nested
index a5e74b3661..8c9cdb369e 100644
--- a/tests/tests/gnv1_nested
+++ b/tests/tests/gnv1_nested
@@ -63,7 +63,7 @@ export SYEAR=2023
 export SMONTH=02
 export SDAY=24
 export SHOUR=00
-export FHMAX=24
+export FHMAX=3
 export FHROT=0
 export DT_ATMOS=300
 export RESTART_INTERVAL='1 -1'
@@ -191,7 +191,7 @@ export D2_BG_K1_NEST02=0.20
 export D2_BG_K2_NEST02=0.15
 export D4_BG_NEST02=0.15
 export DZ_MIN=2.0
-export FULL_ZS_FILTER=.true.
+export FULL_ZS_FILTER=.false. # Must be false to avoid model instability
 export FV_SG_ADJ=300
 export HORD_DP=6
 export HORD_MT=6