Over Wireless - Network Accounts Unavailable

I have seen a couple of posts on this site in regards to this topic, but nothing seems to have worked. Here is what I have...
I have an OS X Server (10.4.5) that is my OD master.
I have a wired/wireless network. Clients are authenticating just fine over the wired network. Clients cannot authenticate over the wireless network (Airport APs that are NOT distributing IP addresses, that is done via a DHCP server).
I have several teachers with laptops, but they are using mobile accounts, so when the login, it appears as a local account to the machine and the login without issue. The server then synchronizes just fine.
I have setup a couple wireless eMacs around the building recently, and have given them static IP addresses (though I would prefer to use my DHCP server which is seperate from my OD server), yet they are not talking to the network or the OD server, it appears, until after a local account is logged in. At that point, I can logout and then log back in using an account setup in WorkGroup Manager.
I have noticed on the login screen that even though there is a static IP address, it is not appearing on the login screen when I scroll through the machine attributes, which hints me to the thought that the machine is not yet on the network. I also cannot ping the machine or hit it with Remote Desktop.
I have tried clearing out the LDAP directory settings and reinstalling them from the wireless network to no avail. I have also attempted to clear out the directory settings in the /Volumes/HD/Library/Preferences/DirectoryService settings, also to no avail.
Any help would be appreciated.

I unfortunately cannot help with your situation, but it seems that you work in an educational environment as I do, and you might be able to help me. I've been running mac networks for a long time, with Xserves since they came out. I currently manage a wired/wireless network with an Xserve G5 as OD master. Up until last week, at any given time, the most clients we had accessing the server at once was about 60 wired computers and maybe 10-15 wireless and things ran beautifully. We just started using 60 new laptops and everything has gone to crap. After 6 months with ZERO server crashes/downtime, I've had 2 crashes in the last week. Even before the crashes, with about 100 clients accessing the network, everything was painfully slow. Portable home directories is not an option because we're not up to 1:1 yet. This is new territory for me. Can you give me an idea of the number of wired/wireless clients you manage? Any suggestions on what upgrades come first, like RAM? I have an Xserve G4 not being used. Any ideas on the best way to use it to help? Thanks for any help you can provide.
Xserve G5 DP   Mac OS X (10.4.4)   1 gig RAM

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