150 down and 15 up is the speed given by your ISP? The real speed depends on the modem and router. You can check the router's WAN to LAN speed here. http://www.tp-link.com/en/article/?faqid=465

If the router in WAN1 connects to your PC directly, can you access internet? What's the IP address obtained? Connecting that router to WAN1 or WAN2 makes any difference?

Open port UDP 500 and UDP 4500 for 192.168.10.1 on the router(192.168.2.1).

Only Power and Ethernet light? Did you reset using the utility? http://www.tp-link.com/en/article/?faqid=601 After reset, if powerline lights are still off even when they are in the same room, check...

There is a second way to clone SSID and security settings. Run the utility of WPA281. Once it s detected, press Connect. Type in admin for username and password. On Wireless---Wireless Settings and...

What you described is how WR841N should work. If the modem router is not using 192.168.0.1, WR841N's will be 192.168.0.1 as default settings.