diff --git a/fuzzers/007-timing/projects/corner.mk b/fuzzers/007-timing/projects/corner.mk
index 5ae80ca8..aaa3cbf2 100644
--- a/fuzzers/007-timing/projects/corner.mk
+++ b/fuzzers/007-timing/projects/corner.mk
@@ -3,6 +3,7 @@
 TIMFUZ_DIR=$(XRAY_DIR)/fuzzers/007-timing
 CORNER=slow_max
 ALLOW_ZERO_EQN?=N
+BADPRJ_OK?=N
 
 all: build/$(CORNER)/tilea.json
 
diff --git a/fuzzers/007-timing/projects/project.mk b/fuzzers/007-timing/projects/project.mk
index daa79aeb..691bb048 100644
--- a/fuzzers/007-timing/projects/project.mk
+++ b/fuzzers/007-timing/projects/project.mk
@@ -8,6 +8,7 @@ CSVS := $(addsuffix /timing3.csv,$(SPECIMENS))
 TIMFUZ_DIR=$(XRAY_DIR)/fuzzers/007-timing
 RREF_CORNER=slow_max
 ALLOW_ZERO_EQN?=N
+BADPRJ_OK?=N
 
 TILEA_JSONS=build/fast_max/tilea.json build/fast_min/tilea.json build/slow_max/tilea.json build/slow_min/tilea.json
 
@@ -28,7 +29,7 @@ slow_max: build/slow_max/tilea.json
 slow_min: build/slow_min/tilea.json
 
 $(SPECIMENS_OK):
-	bash generate.sh $(subst /OK,,$@)
+	bash generate.sh $(subst /OK,,$@) || (if [ "$(BADPRJ_OK)" != 'Y' ] ; then exit 1; fi; exit 0)
 	touch $@
 
 run:
@@ -43,18 +44,31 @@ clean:
 
 .PHONY: all run clean
 
-# rref should be the same regardless of corner
+# Normally require all projects to complete
+# If BADPRJ_OK is allowed, only take projects that were successful
+# FIXME: couldn't get call to work
+exist_csvs = \
+        for f in $(CSVS); do \
+            if [ "$(BADPRJ_OK)" != 'Y' -o -f $$f ] ; then \
+                echo $$f; \
+            fi; \
+        done
 
+# rref should be the same regardless of corner
 build/sub.json: $(SPECIMENS_OK)
 	mkdir -p build
 	# Discover which variables can be separated
 	# This is typically the longest running operation
-	python3 $(TIMFUZ_DIR)/rref.py --corner $(RREF_CORNER) --simplify --out build/sub.json.tmp $(CSVS)
+	\
+	    csvs=$$(for f in $(CSVS); do if [ "$(BADPRJ_OK)" != 'Y' -o -f $$f ] ; then echo $$f; fi; done) ; \
+	    python3 $(TIMFUZ_DIR)/rref.py --corner $(RREF_CORNER) --simplify --out build/sub.json.tmp $$csvs
 	mv build/sub.json.tmp build/sub.json
 
 build/grouped.csv: $(SPECIMENS_OK) build/sub.json
 	# Separate variables
-	python3 $(TIMFUZ_DIR)/csv_flat2group.py --sub-json build/sub.json --strict --out build/grouped.csv.tmp $(CSVS)
+	\
+	    csvs=$$(for f in $(CSVS); do if [ "$(BADPRJ_OK)" != 'Y' -o -f $$f ] ; then echo $$f; fi; done) ; \
+	    python3 $(TIMFUZ_DIR)/csv_flat2group.py --sub-json build/sub.json --strict --out build/grouped.csv.tmp $$csvs
 	mv build/grouped.csv.tmp build/grouped.csv
 
 build/checksub: build/grouped.csv build/sub.json
diff --git a/fuzzers/007-timing/rref.py b/fuzzers/007-timing/rref.py
index 4cf1b9e7..bad37401 100644
--- a/fuzzers/007-timing/rref.py
+++ b/fuzzers/007-timing/rref.py
@@ -221,7 +221,7 @@ def main():
     parser.add_argument('--out', help='Output sub.json substitution result')
     parser.add_argument(
         'fns_in',
-        nargs='*',
+        nargs='+',
         help='timing3.txt input files')
     args = parser.parse_args()
     bench = Benchmark()
diff --git a/fuzzers/007-timing/timfuz.py b/fuzzers/007-timing/timfuz.py
index c1ed1bb7..6287cce2 100644
--- a/fuzzers/007-timing/timfuz.py
+++ b/fuzzers/007-timing/timfuz.py
@@ -187,15 +187,11 @@ def simplify_rows(Ads, b_ub, remove_zd=False, corner=None):
         eqns[rowt] = minmax(eqns.get(rowt, T_UNK), b)
 
     print(' done')
+
+    print('Simplify rows: %d => %d rows w/ zd %d, ze %d' % (len(b_ub), len(eqns), zero_ds, zero_es))
     if len(eqns) == 0:
         raise SimplifiedToZero()
-
-    #A_ub_ret = eqns.keys()
     A_ubd_ret, b_ub_ret = Ab_ub_dt2d(eqns)
-
-    print('Simplify rows: %d => %d rows w/ zd %d, ze %d' % (len(b_ub), len(b_ub_ret), zero_ds, zero_es))
-    #return A_ub_ret, b_ub_ret
-    #return A_ub_np2d(A_ub_ret), b_ub_ret
     return A_ubd_ret, b_ub_ret
 
 def A_ubr_np2d(row):