Hi Spy007,looking into your assessment and giving room for the possibility of an oversite,the problem i guess remains pirifomis syndrome.
The piriformis can go into spasm if the pt overdo his exercise or carried out her program wrongly. Piriformis would go back into spam at slightest opportunity,compressing on the siatic nerve eliciting radicular pain.

Yes,SLR the affected limb would further worsen the torniquet effect of already hyperactive piriformis muscle and more pain ensue.
I think what has happened is nothing but a relapse and the pt must be causioned against over exercising or not complying with precribed home program.
Just what u already know that PS mgt must be tallored along evidence based protocol to succeed.

I wish u all the best.yelufem.