Above (almost double) guidelines sentence based on factors possibly resulting from addiction and the specific harms posed by the substance possessed and dealt is not substantively unreasonable.
Pre-plea disclosure of criminal history did not unfairly prejudice things.
http://www.opn.ca6.uscourts.gov/opinions.pdf/18a0107p-06.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.