Hi steve again and thank you for your inquiry.
Please turn on DEBUG on log level to check the detail of warned entries which include recurrence dates. This would reveal if warned entries really have too many (>100) recurrence dates.
Repeating calendar implemetation is too different between Notes and Google to sync completely on two way. So I limit repeat types to be able to sync. GooCalSync can only synchronize daily (interval=1 only), weekly (interval=1 or 2 only), monthly (interval=1 only), yearly (interval=1 only) as recurrence calendar entries on Notes to Google. Other repeat patterns are handled as "Custom" where every recurrence calendar entries are inserted into Google indivisually using RDATE, iCalendar specification, not as repeated entry. For example, if you have an entry which repeats daily with interval 2 day from 2009-01-01 to 2009-10-10, this ends up not to sync because "dailiy with interval 2" is not supported as repeat type and "from 2009-01-01 to 2009-10-10 with interval 2" means over 100 days, actually 142 days.
Please use DEBUG option to get detail of a warned entry and let me know.
Thanks.