Yes if with hip flexion and knee extension you get a stronger response when you adduct the leg that sounds quite likely to be a positive response. An orthopaedic Pt should know the test. Here is a site explaining it:

The Slump Test

You can sort of do the test yourself but a clinician can do it better. The treatment can be conducted by an orthopaedic PT who uses manual therapy. It is quite an art to treating it as too much mobilisation of the nerve will stir it up while not enough and you won't make progress.

The specific exercise that makes it worse is probably not doing you much good. Just go easy on it and get some help