Hi cellzzzz,
I have used GCALSYNC in the past and found it to be a fantastic program so I can understand your frustration. In the feedback I have been getting from CU500/CU500v owners, it seems that these mobiles are a little more picky about the applications that are installed onto them then previous 3G LG mobiles.
You may like to try the unsigned version if you haven't already and see if that is better.
You may also need to use the GThing tool to change your phone's java profile to
allow access to the calendar from Java.
Let me know if this helps