Shrink pdf optimize not working

I have a pdf form created in LiveCycle.  It has 14 fields, 1 signature, and 2 buttons (reset and submit with jave) it is a very plain document no fance shading or boarders.  It is about 1/2 MB, i need to make it smaller the word doc it is replacing was only like 80KB.

I tried going to Advance > PFD Optomizer but I get the following error

"This pdf document contains adobe xml form. such files cannot be optimized"

I need to be able to fix this using Adobe pro or LiveCycle I dont have access to any 3rd party softare.

Thanks