Do you have SSH access?
Chances are good some of the modifications are using their own seperate tables and not making use of vBulletin tables (especially if they are large extensive modifications). What you can do is get the dump from these tables of your old database and once you reinstall vBExperience, simply import the backup dump, overtop and it should repopulate everything accordingly.
IF you dont have SSH access, or thats beyond your technical knowledge let me know and I can extract the vBExperience tables for you.
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