I got a nonvivo aswell and I couldnt hardmod it either. I used a Rear Window Defogger Repair Kit and although it diddnt unlock the other 4 pipes i got massive artifacting immediatly. I read the instuctions on the kit again and it says not to use your defogger for atleast 24 hours after using the kit so maybe it just needs time for a proper connection, I dont know, but with overclock I get the scores in my sig which are close enough to a XL for me.