new to rooting have a (hopefully) quick question

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http://androidforums.com – I am trying to root my evo 4g with hboot 2.18 without losing my apps or the app data so I can transfer them to my new galaxy s3. Kids would freak if I lost their angry birds progress. I used the non htcdev, non enrevoked3 method to get most of the way there. I have unlocked bootloader and think I got root. I flashed a rom and lost everything but had root access on apps.. So I restored my nandroid backup and got everything back, but lost root permissions when I go to titanium backup. Is there a rom I can flash that wont wipe my apps and data? What, if anything, can I do now? (General)