The difference in CG location between a single elevator servo mounted near the wing verses two elevator servos in the stab is huge. I had a plane that started off with dual elevator servos in the tail, and it was tail heavy by about one inch, or 8 ounces of lead in the nose. I replaced that setup with DEPS, removed the lead, and the cg shifted forward about 1.25 inches. It is an easy decision -- install everything but the elevator setup. Then just figure out what it takes to balance on the CG without adding ballast.

In my experience, most glow pattern planes (even with a YS) will be tail heavy with dual elevator servos in the stab. The short pipe won't offset the CG significantly.