1mg Finasteride daily does NOT reduce serum DHT -- should I up dosage? (photos)

I am 27 years old Asian male. I have been losing hair since May 2016 after discontinuing 2% topical minoxidil for a month (150 hair/day). I got back on 5% topical minoxidil and added 1mg Propecia daily immediately. The shed has not stopped until now (May 2018) and I have thinned out significantly. I had a lab test done in Mar 2018. DHT level = 89 ng/dL which is higher the placebo group (60 ng/dL) in a study and much higher than 1.5 mg group (30 ng/dL). Should I increase dosage?