diff --git a/Makefile b/Makefile
index 014e5f2..3a712a0 100644
--- a/Makefile
+++ b/Makefile
@@ -5,12 +5,14 @@ default: haskell
 
 all: find_tree_matches.exe haskell
 
+GHC=ghc-7.4.2
+
 haskell:
-	ghc -O2 --make Main.hs -o phybin.exe
+	$(GHC) -O2 --make Main.hs -o phybin.exe
 	strip phybin.exe
 
 win:
-	ghc -DWIN32 --make Bio/Phylogeny/PhyBin/Main.hs -o phybin.exe
+	$(GHC) -DWIN32 --make Bio/Phylogeny/PhyBin/Main.hs -o phybin.exe
 
 release: haskell
 	upx phybin.exe
diff --git a/vary_branchlen.sh b/vary_branchlen.sh
index 9adfe96..b358463 100755
--- a/vary_branchlen.sh
+++ b/vary_branchlen.sh
@@ -5,7 +5,10 @@ if [ "$2" == "" ]; then echo "ERR: Two args required!"; exit 1; fi
 
 taxa=$1
 dataset=$2
-branchlens="0.0001 0.001 0.01 0.05 0.1 0.5 1.0 5.0"
+# 12 settings:
+branchlens="0.0001 0.001 0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1.0 5.0"
+
+DOGRAPH="-g"
 
 echo Wiping "$dataset/phybin_output/" ...
 rm -rf "$dataset/phybin_output/"
@@ -15,7 +18,7 @@ echo "[parallel] Starting jobs..."
 for bl in $branchlens; do
     echo "Running with branch len $bl"
     echo "=============================="
-    PHYBIN="./phybin.exe -b $bl -g -n $taxa"
+    PHYBIN="./phybin.exe -b $bl $DOGRAPH -n $taxa"
     outdir="$dataset/phybin_output/brlen$bl/"
     LOG="$dataset/phybin_output/brlen$bl.log"
 
@@ -25,7 +28,7 @@ for bl in $branchlens; do
     # ASSUMPTION2! We likewise expect the inputs in a certain spot.
     RENAMER="$dataset/renaming_table.txt"
     echo "  RUNNING:  $PHYBIN -m $RENAMER -s '_'  -o $outdir"
-    $PHYBIN -m $RENAMER -s '_'  -o $outdir $dataset/final_trees/*BranchLab*.out | tee $LOG
+    ($PHYBIN -m $RENAMER -s '_'  -o $outdir $dataset/final_trees/*BranchLab*.out | tee $LOG) &
 done
 
 echo "[parallel] Waiting for outstanding jobs"