I still have one thats off feed. He has been about 6.5 months. Try a rat that is way too small for them. With my girl that wasn't eating for about 5.5 months, I just tried a little fat fuzzy rat and she ate it, then the next week I gave her 2 of those about 20 minutes apart, and now for the past 2 weeks she has been eating her regular size small rats. Give the smaller prey a chance!
For the one still fasting, I haven't tried the fat fuzzy yet since he just shed, but I tried an ASF and he wasn't diggin it.