Most cards let you force the standard or speed under their properties window in Device Manager. It's odd that setting them to 802.11g-only should allow them to operate at 11Mbps as this speed is not supported by the 802.11g standard (12Mbps is though).
5Mbps is a pretty typical figure for an 11Mbps connection so it would seem the link quality is fine. Try changing the channel anyway just in case there is intererence.
Also make sure you use some form of encryption (WPA/WEP) in case there is a rouge 802.11b device joining to the network causing your cards to slow down for it.
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