Syncing with Google never worked for me until I switched to NuevaSync which is recommended in other threads about this topic.

They have a basic subscription for 15$ per year. https://www.nuevasync.com/

I know it's a shame you have to pay twice to get this functionality but in the end all alternatives and workarounds didn't work for me. If you want to save the 15$ and try your luck: http://wiki.maemo.org/Sync#N900