Updating to a Moto JB leak is a horse of a different color in my experience and really doesn't involve safestrap. When I updated to an ICS leak for the first time on my D4, I ended up fastbooting GB on my device to wipe out all traces of safestrap and any changes it made to my system. I guess my advice would be to fastboot ICS, then flash the leak from stock recovery. Like I said, that's what worked for me updating to an ICS leak with my D4. But I would really get some advice from someone with a Razr who's actually done it though first.
Sent from my Droid 4 - LiquidSmooth