E2000 unable to achieve high wireless speeds

I have an E2000. I can't seem to get hire than 75Mbps from various laptops with 802.1n cards in them.
I have the 1.0.0.4 firmware flashed just three weeks ago. I am sitting very close to the access point. I have tried channels 1, 6 and 11 and fiddled with the advanced wireless settings as people recommend. Nothing above 75Mbps. One laptop briefly jumps to 144Mbps but then back down again.
I've tried 20mhz and 40mhz channel width as well as 2.4ghz and 5ghz. What's the go? Is anyone getting 300mbps on this thing or have I been sold a dud?

Do you have a lot of other access points nearby? The more interference from other access points you have the lower the negotiated rates, although it may in fact get a higher rate during actual transfers.
Does you laptop support the 5 GHz band? That's usually less crowded.

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