SNAT DVR not working, missing iptables rules?

Hey, i have setup a newton/centos7.3 based installation in my lab at home, using Openvswitch/DVR as far as i can tell, tenant network traffic to external networks is not working. FIP & provider network traffic is working fine for vm´s. i tried to dig a little deeper into this, and i am pretty sure that for some reasons the SNAT rules on the network/controller nodes are not created for the snat router instance. at least i am able to see traffic flowing to the snat router, but no traffic leaving the router at all. i have created a detailed description of my home cluster and put it on pastebin. it includes all configuration files of all nodes, and the output of ip netns stuff, as well as iptables rules from all nodes. here is the pastebin link: http://pastebin.com/hw5MGsLJ i am pretty stranded right now, as i have no clue what is going wrong with my DVR SNAT setup.