escaping double quotes and percent signs (%) in cron
You have to escape the % signs. They have a special meaning in crontabs:
man (5) crontab:
Percent-signs (%) in the command, unless escaped with backslash (\),
will be changed into newline characters, and all data after the
first % will be sent to the command as standard input.
This doesn't directly answer your question, but I would suggest that you create a script file in /usr/local/bin (or ~/bin or whatever is appropriate) and call that from cron. It's easier to test and edit.