Are you using version 2.0.3?
Have you tried using the uninstall feature and then re-installing the application?
Have you tried targeting the Snapz Pro X preference file?
Regarding the sluggish system and other problems, check this link for system troubleshooting procedures and when doing so, follow all steps/instructions in the order provided.
http://www.thexlab.com/faqs/repairprocess.html
Nothing is preserved and transferred to the new system using the A&I method when not selecting preserve user and network settings.
Address Book data is stored in the AddressBook folder located at Home > Library > Application Support > AddressBook.
To create an Address Book backup file, at the Address Book menu bar go to File and select Back up Address Book. The default name of the backup file is Address Book - (and today's date).
To recover ALL contacts from this backup file if needed, at the Address Book menu bar go to File and select Revert to Address Book Backup selecting the backup file created.
The link I provided in my previous post should give you all the answers you need regarding the A&I method.