Here's a guide on how to get S-OFF if you're running the latest stock OTA with HBOOT 2.18:
[GUIDE] How to achieve S-OFF after unlocking 2.18 HBOOT with HTCDev.com - No More Watermark!
It's a few steps, but worth it in my opinion, since you can even go back to Froyo after you're done, if you want .
Just read through your write up. Awesome! Thank you Captain_Throwback. Wonder if this would work for the 3D?