For the record, I am not wiping SD-EXT when I hop from rom to rom anymore. So far it hasn't caused me any issues. I just restore about 9 apps with data on the ones where I want data to be transferred and so far no issues. Pretty nice not having to reinstall everything every time I flash a rom. The reason it works is because app data is stored in the /data partition instead of the /sd-ext partition, so it basically just leaves the base app available upon boot when doing this.