Syncing Outlook Calendar Events to Google Calendar
Not sure, as an alternative:
An alternative to the google calendar outlook calendar sync issue is as follows:


Ensure that you export all outlook calendar into google calendar once only (ensure that you use your google calendar not the phone calendar for all appointments or change them so that they are)
Use google calendar to create and update all events
To then use outlook: export from google calendar and then import this calendar into a NEW outlook calendar
Rename the new calendar in Outlook to today's date (deleting or hiding other outlook calendars)
Repeat steps 3 and 4 on a regular basis , deleting the out of date ones from outlook


Regards

Chris UK