Worried mother of Autistic son

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• My autistic son was put on clonazepam 1.5 mg daily for 4 weeks.  We started a taper and are currently at 0.8 mg after 6 weeks of tapering.  He is non-verbal and I feel he is not having issues thus far.  

My question is; will the amount he was taking, and the length of time he was on them, factor into him having a good outcome for his completed taper?
 Honestly I’m scared to death of causing him harm from not doing this taper properly.  We were advised to taper .125 mg every 3 days.  I have decided to do 10% of his last dose every 7-10 days.  Am I going too fast or too slow. I just want what’s best for him, and not cause him pain.  Some of the things I’ve been reading are causing me grief, and I would just like to know if anyone has tapered with little to no problems.  Please give me some feedback.