Jmark, that doesn't make sense.
EAS imports to the EAS Account.
Palm DTA goes to Palm Profile account. Separate but equal here. This is not your grandfather's palm where all accounts go into one bucket.
I'd suggest instead that on average, even busy people generally have no more than 1500 calendar events per year (5 per day). So 9500+ events represents at least 4 years of past data. Palm Pre doesn't appear to handle past data well. In particular, recurring events that span the Energy Policy Act of 2005 (a Bush era law which dictates a change for Daylight time in 2007). If the recurring starts in 2006, has an instance in March 2006 which is Standard time, and also March 2008 which is daylight time, this appears to be a problem.
Outlook and Palm Desktop allow you to archive old Calendars. Cut it back to 2008 and higher, rerun DTA, and you'll probably have no problems at all.