Reducing the file size of an XML Form

We have created and launched a number of PDF Forms (created in LiveCycle) for our contacts to download, complete electronically, and email or fax back to us. The problem we are running into is that our email client allows us to only receive files that are 10 MB and smaller. We are finding that many of our PDF Forms that end-users are completing online cannot be emailed back to us because the file size is too large....which creates a problem.

How do we troubleshoot this? We cannot seem to optimize in Acrobat because we receive an error message that says, "This PDF contains an Adobe XML form. Such PDFs cannot be optimized."

HELP!

Thank you!