you mentioned that you are using another router now? maybe you can try my config, mine was almost the same as yours, but latency is very high due to low signal, what i did was to setup my second router as a network repeater, basically router connects to your main router, and put out wifi signal through it. with that, i get strong connection in my room now. Not sure how you config yours, but i think google should be able to find out 

ping 192.168.0.1 or 192.168.1.1 or your specific router address over wifi and view the latency... it shouldnt exceed 20ms
if it does, your wifi is to blame
if it doesnt exceed, means your connection to router is stable, the problem is at TM's side.

if it's your router what you can do is download InSSIDer to scan the wireless networks around you, view which channel/frequency is less or not used by your neighbours and select that frequency in your router.

if you have no wireless b & g devices, set your router to run wireless N mode only.
if you can run wireless N only, experiment with 40mhz setting on/off and and wmm on/off, see which gives you better performance.

also remember to set wireless security to wpa2-psk only and AES cipher only.
other wifi settings that may be relevant: http://www.dd-wrt.com/wiki/index.php/Advan...reless_settings
The concept of these reccomendations applies to most if not all routers

Router antenna position is important too, if you plan to focus the signal on the same floor, put the antennas vertical, if upstairs, horizontal, the output pattern of antennas are like this:

As long as you can make sure the latency does not come from your end, then it's time to call tm.
easiest way is to connect to the router with lan cable and ping google, if its still 3k ms like you mention, it is most probably not your wifi/routers edy

damn. =\ hope you can fix it...

still any hope? coz i'm also in your situation.. i flash the wrong openwrt.. my 1043nd is 1.10

ROUTER PROBLEM BRO.
THROW THAT DLINK OUT Xd