Hi Marticlar,
i would like you to answer a few questions please.

1/ any back pain?
2/ why do you think the right SLR was more restricted than the left when the pain is right sided?
3/ how did you come up with your diagnosis?
4/ you say that you gave Mckenzie exercises, which ones. by this i assume you mean extension in lying, but from your assessment there doesnt appear to be clinical reasoning for this. can you explain?
5/ is the patient off work? what is his/her job ?
6/ Posture?
7/ how many times have you seen them? if it is only once then he may have been worse after the exercises due to what you had done in the asessment rather than the exercises.

Hope to here more from you.

john