Also, this is just a general note on thrusters, and the design intent;
Thruster set-ups (including 2+1), are really designed for laying the board over, quite hard off the bottom, and having the outside fin "out of the water".
If this doesn't sound like your type of surfing, then maybe Single Fins are quite OK for you...
Me personally, I love singles, and I also love 2+1, or I like to say 1+2 (1 Centre plus 2 side bites)...