Did a little digging into the tie-breaker in the event all 3 teams go undefeated - which all 3 teams are favored to do (at least on a game by game basis not necessarily when stacked). This would mean the tie-breaker goes to opponent conference win %.
Currently - Miami has the slight edge. Our opponents are currently 13-18 in conference, Clemson opponents are 12-18, and SMU opponents are 11-19.
FSU and Louisville are a clean wash across the board as all 3 teams play those opponents. Their results don't matter unless they play someone that is on no one else's schedule which is only Louisville playing BC (SMU plays BC and Miami and Clemson do not).
Miami's uncommon opponents are GT and Syracuse. Clemson has 1 uncommon opponent in NCST. SMU has 1 uncommon opponent in BC. GT and Syracuse are definitely the best 2 teams of those 4 strongly favoring Miami's odds to be the 1 seed.
Key games that factor into this equation down the stretch will be:
Syracuse at Pitt - This Thursday - Syracuse beating Pitt favors Miami +1 game over both SMU and Clemson
Syracuse at BC - Nov 9 - Need a Syracuse win to add +1 over SMU
NCST at GT - Nov 21 - GT beating NCST is another game that favors Miami over Clemson
Obviously both SMU and Clemson vs Pitt will be big as Pitt is still undefeated in conference. Even if they both stay undefeated that is 2 L's for Pit that don't hit Miami. Also, Clemson has played the most conference games but definitely has the toughest road ahead with a road game at VT and Pitt plus Louisville at home. Would not be surprised to see them slip up and drop one of those. Clemson's defense has been gashed as well.