a flood of system event force the process event out
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Something is not correct in your description. The Event Storage service uses separate storage for each event category; hence system events cannot push process events out.
(alarms are handled differently; they share same FIFO and storage in the Alarm Manager)
I'm not able to answer for which manual the Event Storage service parameters are discussed in today.
Adobe Reader can perform linear search in folders on the harddisk. Try having it to search the documentation folder on DVD1 (or was it CD1?) of the System 800xA Media.
Service Structure. Event Storage Service. Special Configuration. "BEGIN" For each category to enlarge change settings. Change Max no of events from 10.000 to 50.000. Change file size from 1x to 5x. Do not change number of files. "END" for each. Apply.