I have a 1GB connection from service provider, when plugged directly into their connection I get 950+Mbps. When through the Tik, 160-200Mbps. I have WAN on Ether11, LAN on Ether1, firmware at 6.39.2. Any thoughts/ideas? Thanks!

We can't remotely begin to help without seeing the config.
you need to post the compact export for interfaces, bridges, and firewall. Maybe even the queues.