Print server spooler generating excessive traffic

Hi there, My problem is as follows. I have 2k clients printing to a NT server which spools the jobs of 10 printers on to the relevent HP Jet direct print server. The spooler service on the server, when viewed in perfmon, is soaking up nearly all the CPU cycles and creating a lot of network traffic (when I stop the spooler service, CPU + bytes sent received return to very low levels)I would understand this if there was a lot of printing going on but there isn't. Also on the Workstaion in event viewer there sre multiple event ID 20 in the system log and a list of the brother drivers added. even when I delete all drivers as per http://www.jsifaq.com/subj/tip4500/rh4559.htm this still occurs multiple times. Previously I was printing direct to the HP jetdirect print server from the workstations and everything worked fine. However in order to use new software (Print Manager) I need to spool jobs centrally.
Any help would be greatfully received.