This rings a dim bell from the distant past.
I'm not sure if gContactSync uses ms exchange, but, back in the windows mobile sync days, there was a size limit on the notes field and exchange sync evolved out of activesync.
fwiw, I have run into other google sync notes field "gotchas" that could bite. One primary example for me is that I frequently used hyperlinks in notes and, to my dismay, found that google's m sexchange sync is set to not only remove hyperlinks, it removes the entire text of the hyperlink... for example
Joe's phone is TEL:512-555-1212
ends up as
Joe's phone is
Hope that this information is of value.
Beverly Howard