Thanks for the info WoodyZ,
I looked into this and found an article that talks about creating a config file to apply settings:
A Power User's Guide to VMware Fusion
It mentions that if a config file does not exist, just create a text file called config and place it in ~/Library/Preferences/VMware Fusion/
I created this and added the line prefvmx.minVmMemPct = "25" but It didn't make any difference so I will test applying the other settings it talks about in this post to see if the config file still works.
I will test and post my results