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The two folders are not called the same, could that be the issue?
No, the folder names don't matter as long as they match the path names in iStripper.
You do have a problem. There are files in your models folder that should be in your data folder and there are some files missing from your models folder. See the attached screen shots for what should be where. It is likely that you have the same problem for most of your collection. Check every card in your collection.
If the time and cost of redownloadng your collection, clicking on "Rebuild collection" in Advanced setting is probably the simplest solution. (I'm not an exper at this, but I'm pretty sure it will work. If you want to avoid downloading, you can probably fix it manually. Here's how:
1. Shut down iStripper
2. For each card where there are missing files in the data folder, move missing files from the models folder to the data folder.
3. For each card where there is a duplicate file in the models folder and the data folder, trash the duplicate from the models.folder.
4. You can create your own n9999.vhdshows and n9999.vhdtrailers files. They are needed. Each is a simple text file with the card's resolution. For a1312.vhdshows you need "1080p" in that file. I know it's a 1080p card because your file sizes match mine. You can create it with the Mac text edit program. If you have any 720p cards, "720p" must be in the file. If you have any 3k cards, those should have "3K" in the file.
5. When all the fixes are accomplished, start iStripper and see what happens.