Slow transfer speed with Airport Express N in an N-only 5Ghz network.

I have a Time Capsule set to 802.11n-only (5GHz).
My new Airport Express N is set to extend such network.
I have a Mac Mini connected via Ethernet to the ethernet port of the Airport Express; however when I transfer files from the Mac Mini to Time Capsule the speed is incredibly slow (1 Megabyte of data every 3-4 seconds).
I know I'm supposed to get 100Mb/s via the Ethernet airport.
Any ideas?

I have the same problem with the 5ghz mode from my time Capsule. The connection is fine until the wireless connection is maxed out, then the wireless conenction drops and I have to click on the airport toolbar icon to get it reconnected (Just click on the menu item...I dont actually have to re-select the wireless network).
Dropping down to the 2.4ghz mode solves the problem, but I want the bandwidth increase 5ghz gives me. Thats why I bought the Time Capsule to begin with.
Some have said that this issue started with Leopard. I cannot confirm this since I didnt have any 802.11n equipment until after I upgraded to Leopard. Also, I noticed that with Time Capsule firmware 7.3 the connection drops but the airport icon stays solid. In 7.3.1 the connection drops and the airport icon greys out (indicating no connection).

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    MacBook Pro 17"   Mac OS X (10.4.8)  
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    Uncached Read 53.66 15.70 MB/sec [4K blocks]
    Uncached Read 136.76 68.73 MB/sec [256K blocks]
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    Uncached Read 93.26 0.66 MB/sec [4K blocks]
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    Uncached Write 98.83 31.64 MB/sec [256K blocks]
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    Model MacPro3,1
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    Uncached Write 37.22 21.06 MB/sec [256K blocks]
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    Uncached Read 93.55 0.66 MB/sec [4K blocks]
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