Nothing much 'subtle' about deltas, but the elevon idea may result in some loss of pure elevator movement. One of the likeable things about deltas is the ability to land at speeds and AOA's that normal airplanes cannot reach. Losing the elevator as a separate surface, and reducing the total movement in 'elevator' mode because of the responsive ailerons may mean you won't be able to use this feature any more. Consider, instead, separate aileron servos (instead of the snakes), and maintaining the current elevator set-up. Best of both worlds, that way.
Evan, WB #12.