Had enough of the WiFi reception and opened up my TF201 64GB today.
Applied pads of solder at where pogo pins connect - scraped the finish of the solder to bare an unoxidized and more conductive layer to attain better contact. Next I insulated all unused antennae connectors and taped the built-in antennas as well. This reduces external impact on signal. I'm currently also thinking about insulating parts of the pogo pins.
No pics of how it's insulated - simply insulate everything that might bias the signal, especially those unused antennae connectors.
Results? Went from -83dB, rather unusable up to between -65dB and -57dB. Web surfing works and that's all that matters to me.
Hope you find this useful and have a good day.