Hi Derek,
Are you planning on building the combat wing/stabilator version, or the sport/stunt fuselage version with a standard stab/elevator?
Either one could handle the Enya, 29 or 35. Due to the slight extra weight you might have to lengthen the tail boom/fuselage a bit to get the balance point positioned properly.
Ordinarlily these planes seem to do best with the balance point on the spar. The Enya is, I think, about 1/2 oz heavier than an OS LA 25.
Get all this trimming done before completing the plane. It's a lot easier to get the plane setup close to optimum before completely finishing it.
Phil C