Atheros AR9285 only 65 Mbit/s

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http://askubuntu.com – I have an ASUS K53E laptop, running Ubuntu 12.04. Love it, the only OS so far which doesn't give me problems! Anyway, my wireless network adapter is pretty much crap. It runs at only 65 Mbit/s, while it can handle 300 Mbit/s. It's an Atheros AR9285. I googled around, found suggestions of setting the channel and frequency of my router. So set the 5 GHz band to force 40 MHz and Wireless-N, and I set the 2.4 GHz band to choose between 20 and 40 MHz, also forcing Wireless-N. My router is a Cisco Linksys E3200. When I run a speedtest at speedtest.net, I get 21 MB/s download and an unstable 9 MB/ (HowTos)