diff --git a/Dockerfile b/Dockerfile
index 716b3f03..2ab19ad7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -47,7 +47,7 @@ RUN easy-add --var os=${TARGETOS} --var arch=${TARGETARCH}${TARGETVARIANT} \
  --from https://github.com/itzg/{{.app}}/releases/download/{{.version}}/{{.app}}_{{.version}}_{{.os}}_{{.arch}}.tar.gz
 
 RUN easy-add --var os=${TARGETOS} --var arch=${TARGETARCH}${TARGETVARIANT} \
- --var version=1.4.2 --var app=mc-server-runner --file {{.app}} \
+ --var version=1.4.3 --var app=mc-server-runner --file {{.app}} \
  --from https://github.com/itzg/{{.app}}/releases/download/{{.version}}/{{.app}}_{{.version}}_{{.os}}_{{.arch}}.tar.gz
 
 RUN easy-add --var os=${TARGETOS} --var arch=${TARGETARCH}${TARGETVARIANT} \
diff --git a/build-multiarch.sh b/build-multiarch.sh
new file mode 100644
index 00000000..4694c66e
--- /dev/null
+++ b/build-multiarch.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# manually purge any pre-existing manifest list
+# since docker manifest command lacks a "remove" operation
+rm -rf ~/.docker/manifests/docker.io_itzg_minecraft-server-multiarch
+
+export DOCKER_BUILDKIT=1
+
+docker build --platform linux/arm64 -t itzg/minecraft-server:arm64 .
+docker push itzg/minecraft-server:arm64
+
+armv7tag=armv7-buildkit
+armv7workDir=/tmp/armv7-$$
+git worktree add $armv7workDir armv7
+# sub-shell for build of armv7
+(
+  cd $armv7workDir
+  docker build --platform linux/arm/v7 -t itzg/minecraft-server:$armv7tag .
+  docker push itzg/minecraft-server:$armv7tag
+)
+git worktree remove $armv7workDir
+
+docker pull itzg/minecraft-server
+# use the rpi build one for now since armv7-buildkit is giving ABI mismatch on curl
+docker pull itzg/minecraft-server:armv7
+
+docker manifest create itzg/minecraft-server:multiarch \
+  itzg/minecraft-server \
+  itzg/minecraft-server:armv7 \
+  itzg/minecraft-server:arm64
+
+docker manifest inspect itzg/minecraft-server:multiarch
+
+docker manifest push -p itzg/minecraft-server:multiarch
diff --git a/server.properties b/server.properties
index 445e9027..340ba9df 100644
--- a/server.properties
+++ b/server.properties
@@ -22,6 +22,7 @@ snooper-enabled=true
 texture-pack=
 online-mode=true
 resource-pack=
+resource-pack-sha1=
 pvp=true
 difficulty=1
 enable-command-block=true
diff --git a/start-deployBukkitSpigot b/start-deployBukkitSpigot
index 05e29994..fec3f655 100644
--- a/start-deployBukkitSpigot
+++ b/start-deployBukkitSpigot
@@ -5,6 +5,11 @@
 set -e
 
 function buildSpigotFromSource {
+  if [[ ${TYPE^^} = *BUKKIT ]] && ! versionLessThan "1.14"; then
+    log "ERR craftbukkit build is only supported for versions less than 1.14"
+    exit 1
+  fi
+
   log "Building Spigot $VANILLA_VERSION from source, might take a while, get some coffee"
   rm -rf /data/temp
   mkdir /data/temp
@@ -15,12 +20,24 @@ function buildSpigotFromSource {
   logn ''
   curl -sSL -o /data/temp/BuildTools.jar https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/artifact/target/BuildTools.jar && \
     java $jvmOpts -jar /data/temp/BuildTools.jar --rev $VANILLA_VERSION 2>&1 |tee /data/spigot_build.log| while read l; do echo -n .; done; log "done"
-  if ! mv spigot-*.jar /data/spigot_server.jar; then
-    log "ERR failed to build Spigot"
-    cat /data/spigot_build.log
-    exit 1
-  fi
-  mv craftbukkit-*.jar /data/${SERVER}
+
+  case ${TYPE^^} in
+    SPIGOT)
+      if ! mv spigot-*.jar /data/${SERVER}; then
+        log "ERR failed to build Spigot"
+        cat /data/spigot_build.log
+        exit 1
+      fi
+      ;;
+    *BUKKIT)
+      if ! mv craftbukkit-*.jar /data/${SERVER}; then
+        log "ERR failed to build Spigot"
+        cat /data/spigot_build.log
+        exit 1
+      fi
+      ;;
+  esac
+
   log "Cleaning up"
   rm -rf /data/temp
   cd /data
@@ -73,7 +90,7 @@ case "$TYPE" in
 esac
 
 if [ ! -f $SERVER ] || [ -n "$FORCE_REDOWNLOAD" ]; then
-   if [[ "$BUILD_SPIGOT_FROM_SOURCE" = TRUE || "$BUILD_SPIGOT_FROM_SOURCE" = true || "$BUILD_FROM_SOURCE" = TRUE || "$BUILD_FROM_SOURCE" = true ]]; then
+   if isTrue "$BUILD_SPIGOT_FROM_SOURCE" || isTrue "$BUILD_FROM_SOURCE"; then
      buildSpigotFromSource
    else
      downloadSpigot
diff --git a/start-minecraftFinalSetup b/start-minecraftFinalSetup
index c17ce18c..6b1e858c 100644
--- a/start-minecraftFinalSetup
+++ b/start-minecraftFinalSetup
@@ -135,24 +135,25 @@ if isTrue "${USE_AIKAR_FLAGS}"; then
   fi
 
   JVM_XX_OPTS="${JVM_XX_OPTS}
-  -XX:+UseG1GC -XX:+ParallelRefProcEnabled
+  -XX:+UseG1GC
+  -XX:+ParallelRefProcEnabled
   -XX:MaxGCPauseMillis=200
   -XX:+UnlockExperimentalVMOptions
   -XX:+DisableExplicitGC
-  -XX:-OmitStackTraceInFastThrow
   -XX:+AlwaysPreTouch
   -XX:G1NewSizePercent=${G1NewSizePercent}
   -XX:G1MaxNewSizePercent=${G1MaxNewSizePercent}
   -XX:G1HeapRegionSize=${G1HeapRegionSize}
   -XX:G1ReservePercent=${G1ReservePercent}
   -XX:G1HeapWastePercent=5
-  -XX:G1MixedGCCountTarget=8
+  -XX:G1MixedGCCountTarget=4
   -XX:InitiatingHeapOccupancyPercent=${InitiatingHeapOccupancyPercent}
   -XX:G1MixedGCLiveThresholdPercent=90
   -XX:G1RSetUpdatingPauseTimePercent=5
   -XX:SurvivorRatio=32
+  -XX:+PerfDisableSharedMem
   -XX:MaxTenuringThreshold=1
-  -Dusing.aikars.flags=true
+  -Dusing.aikars.flags=https://mcflags.emc.gs
   -Daikars.new.flags=true
   "
 fi