Mark786, sorry about the plane. I have built three of these (yes 3, don't ask why) and have had similar problems. On #2 I put 2 servos in the tail, but this added weight and I could never get the servos to move together. On # 3 I use a slick device from Don's Hobby, you may have seen it. This allowed me to reduce servo count and put the one elevator servo mid fus. which resulted in short control linkages.

I will be building the Sukhoi or Ultimate soon and will use this set up again.