The degree of difficulty for the Miami Hurricanes football team has gone up a few notches. No. 13 UM will leave Friday for its biggest game of the young season against the No. 24 Texas A&M Aggies, who play at a Kyle Field Stadium that seats 102,700 fans. The Aggies (1-1), of the Southeastern Conference, were No. 6 in the polls last week before being upset 17-14 by Appalachian State, and now they’ll face a 2-0 Canes team that will be without the services of top receiver Xavier Restrepo. Restrepo, a 5-10, 198-pound third-year slot receiver with 172 yards and one touchdown on 11 catches, sustaine…