SPEKTRUM PROBLEM WITH XP SERVO??

[Brooks]

Hi I own a Xray T2 008 and have recently changed over to a Ko Esprit Vantage 2 Spektrum systerm.
When i power the Lrp Sphere , i get perfect throttle but not full steering, i am using a Xp Digital Ds1313 which i bought from new, owned for 2 years.
I get full steering left side but little the right side.
I aslo own a Schumacher Cat SX which i am using the same the speedo but a Savox servo and that works prefect with the KO spektrum Handset, full steering each side.
When i plug the Xp servo into my old 40 mhz systerm it works fine, full steering.
I have never seen this before and i have no idea what it is.
I think the Xp servo doesnt like my Spektrum systerm but i know other people who run the same servo with Spektrum and they have no problems.

Please help as i have been pulling my hair out over it

Cheers
Chris B