RichD

The point being missed by several posts is that they did not look closely at the picture you posted. The servo arms are pointed to the same side, therefor you don't need reversing at all. What they are referring to is when the 2 servos are mounted below the stab. In that case, unless the one servo arm is pointed up and the other down, you would need a reversing y-lead.

Your choice of the 9C is good. Although the 7C is not bad, it is less able than the 9C.

Safe flying!