GCN Gamecube save hacking

[jdev]

I lost my Gamecube memory cards when I moved, and I had to buy a new one to play on my Wii, and I didn't really want to redo all the grinding in Baten Kaitos. I made some saves and transferred them to an SD Card, using my softmodded Wii, and I'm pretty sure I found the correct offsets for gold and experience (they were the same across three files, and I couldn't find any other areas that fit), but when I loaded the hacked saves back onto my memory card, the save files were corrupted. Would the corrupted save be caused by a bad checksum? If so: I don't really know anything about checksums, and this seems like it might be a good time to learn. If not, should I look for another area in the save file where that data would be stored? Or am I just in way over my head?