F5 VPN (Edge Client) and server configs

I've had sporadic problems deploying the F5 vpn client. I have a composer pkg with the Mac_edgesvpn.pkg and the config_tmp.f5c. I have both set to root:wheel and perms of 777 and sitting in /private/var/tmp

then I have a postflight script that runs that does the installer -package stuff

#!/bin/sh
installer -package "/private/var/tmp/mac_edgesvpn.pkg" -target /

sleep 15

rm -rf /private/var/tmp/mac_edgesvpn.pkg
rm -rf /private/var/tmp/config_tmp.f5c

exit 0      ## Success
exit 1      ## Failure

half the time it deploys the server configs, the other half it doesn't.