I've done some research for you. The 9.18.79 system version you have will not allow you to unlock the boatloader. The last version that could be bootloader unlocked was 9.16 system version. The update to 9.18 patched the security hole that allowed bootloader unlock. Sorry for the bad news. The bright spot however is that you have root. Consider yourself lucky. User's with the latest version can't even root.
I'm not recommending this, and would recommend you PM Matt G (developer of the Razr Utility) and ask him if what I am suggesting would work before trying. Since you are on 4.1.2 rooted you may be able to flash back to 4.1.1 with the Razr Utility 1.20 (I think that's the right version). That would also put system version 9.16.XX on your phone. From there you can root 4.1.1, protect root with Rootkeeper and take the OTA update to 4.1.2 from verizon. Once on 4.1.2 you could root and unlock the bootloader with the utility you have. I say again, PM Matt and see if this works. One other way to find out is to go here and ask the question: http://www.droidrzr.com/index.php/fo...qa-discussion/. Hope this helps.