When you compare glow engines to gassers, be sure to include the motor mount and/or muffler in your overall weight. You'll find that the typical 1.20 FS glow + motor mount weigh around 36-42 Oz. Backplate mounted gasser like the G23/G26 don't need a motor mount and may end up weighing only 10 Oz. more overall.

Considering the fact that you'll carry less fuel and the tank can be move off the nose to over the CG, the weigh "penalty" may be trivial at best.