The Ninth Circuit has determined that a sentencing enhancement can be considered when determining whether a petitioner has been convicted of a per se particularly serious crime (i.e., whether it is an aggravated felony for which a sentence of at least five years was imposed).
The full text of Mairena v. Barr can be found here:
http://cdn.ca9.uscourts.gov/datastore/opinions/2019/03/07/15-72833.pdf