Because you are installing an 802.11g WLAN and have been able to overcome problems by changing channel, I have a hunch that you are experiencing 802.11g degradation due to the presence of 802.11b stations. 802.11g APs use a protection mechanism to reduce collisions when operating in the vicinity of 802.11b stations on the same channel. If protection is not enabled, collisions cause throughput to drop significantly. On the other hand, when protection is used, the mere presence of 802.11b stations increases WLAN overhead, causing throughput to drop. To learn more about protection, its impact on 802.11g WLANs, and what you can do to minimize impact, read this WLAN Advisor Tip.
Dig Deeper on Wireless LAN (WLAN)
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