Hi,
After setting of larger values for Oracle NCA Client Emulation Pragma-Mode have you also cleared the "Enable Heartbeat" option within the Client Emulation settingsas suggested in the following KM:
http://support.openview.hp.com/selfsolve/document/KM194854
Additional suggestion you can try is to enable the recording of objects by name.
http://support.openview.hp.com/selfsolve/document/KM1269804
Please follow the instructions enabling the recording of objects by name in the LoadRunner User guide.
Kind regards,