I would also take it to the shop for an inspection- but before I did (if I were you) I'd have a quick check to see where the spoke ended up in the nipple. If it's up to tension and the spoke isn't close to the slot, something is wrong. Once the threads are hidden in the nipple it about 3 1/2 turns to reach the slot. As you said in your op there were still threads showing when it felt tight. There is no way you could make up for that discrepancy in spoke length. Read FBinNY's response and follow the advice.