Going to "Normal Mode" helped tremendously. I haven't heard back from Goosync but it looks like if there's an interruption in the synchronization, the sync mode reverts back to "Slow Mode" where everything is thrown on the server and filtered back to WM and Google.
My guess is somehow the filtration process got botched and shuffled my contacts as well as duplicating the appointments. So far I've done four syncs without an issue. I just have to make sure Goosync is in "Normal Mode".
I'm moving on to Nuevasync and then a few others. I should have a big OTA Roundup ready to send to the editor by first of next week.