I know a professional model that stays in the single digits year around bro. He hates it too. I wouldnt worry too much about being that lean 10-14%BF is a great range. But here is what he does to stay that way.

4-5 days per week first thing in the morning on an empty stomach he does
10x1 min sprints with 1-2 min rest intervals in between in which he walks. He does it on the treadmill and his sprints are run at 15mph and his walking sessions are at 4.5 miles per hour. Once he completes his last run walk cycle he put the treadmill on a 15% incline and walks for 20 minutes. Thats 40 minutes of cardio 4-5 days per week and its a mixture of HIIT and slow paced cardio.

His lifting schedule is a little different. He trains to failure and uses mostly compound movements and normally uses a high rep scheme of 15-20+ but on occassions uses lower reps of 5-8. He only uses 1-3 sets per exercise. He changes up his split and exercises alot but its mostly Bench Presses or Incline Presses, Squats or Hack Squats, Deadlifts, Pullups(he does a shit load of pullups), Dips, Military Presses, and a few isolation exercises like lateral raises, curls, and maybe some pushdowns and abdominal work.

His diet is high protien, moderate carb, and low fat. Ill try to attach a pic of him shortly.