Speed issue with the AirPort Extreme (802.11n)

Hi, I was wondering if anyone could help out with this.
I am the Design Manager and IT Director at a publishing company where we have just upgraded to an AirPort Extreme (802.11n) base station to drive our network. We went this route as all of our machines are Mac Minis with built-in Airport and we were in a situation where re-doing a hardwire on the building was not going to be a possibility due to budget costs.
Our new configuration seems to be running very well and has the following devices connected to the AirPort Extreme:
Linksys Firewall Router (which was used on our old system and was requested by corporate to stay in the lineup to keep the static IP addresses we've already defined for our printers, VPN, etc. intact). The configuration on this part is modem to Linksys router to uplink port on the Airport).
New Panther, Intel based Xserve connected to the Airport's Ethernet port 1.
A 4 port ethernet switch connected to the Airport's Ethernet port 2 which drives four of our HP LaserJet printers.
Ethernet port 3 is not occupied.
All of the ethernet cords connecting our equipment are brand new.
For the most part, everything's been running blazing fast with a remarkable speed increase over our old hardwired setup. However, I've received a few complaints about slow speeds when dragging and dropping and working with files that are stored on our Xserve - we get alot of the "spinning wheel" and the transmission speeds seem very slow.
At present, we have several category 6 ethernet cords on backorder. I was planning on using one to take advantage of the gigabit ethernet capabilities between the Airport and the Xserve (as these are the only two elements of the network that support gigabit ethernet, besides the majority of our Mac Minis. Printers and cable modem are only 10-100 capable, so those will stand as is).
Can anyone tell me if the gigabit ethernet cord will be the solution to this one slow aspect of the new network? Any other settings I could apply to possibly speed up the transmission time when moving files to and from our server? Good news is that every workstation in the house is getting a full 4 bars.
Many thanks!

PS, just wanted to point out that we are also running in bridge mode.
Thanks!

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