Did you take care of the mite problem? Typically a stressed snake will curle and hide forever somewhere in the cage, but if you are saying that it was about to sched and then it didn't sched that seems a lot like humidity issue.But than you are saying that you always keep the humidity at 60 %.And that doesn't make any sense because 60% and 27C temperature is the right humidity to get a perfect sched. So I would say take care of the mite problem if haven't done so yet vbecause that may be why it is moving all tha time and let him stay for a week no handling and than try a thawed mouse rinsed with hot water .