You might want to check the specs again.
When you run two motor in parallel the speed controller will see the total as half (1/2) the value of one motor, so in this case 2 X 12T motors will make the esc see them as a six (6) turn motor.
The other thing to consider is that the Titan 12T motor is rated for a max of 8.4 volts not 14.4v.
If you check the Traxxas website all this information is there.
Originally Posted by Traxxas.com
NOTE: Titan 12T motors are intended for use in single motor and single battery pack applications, up to 8.4 volts. Traxxas does not recommend the use of Titan 12T motors in dual motor vehicles, such as the E-Maxx, Villain, or Villain EX.