When lying prone, i can raise my right leg to about 85 deg and left to about 90 although when i lift the left it gives a nerve tension feeling like when you do the slump test. On the hamstring/ glut note haven't been tested yet, once someone did tell me i seemed to have right glut weakness when i was learning to do a supine bent leg raise. I think that may not be accurate as i was just learning the movement and now i can do it equally well on both sides. I do find it difficult though because of tight ITBs.
I 've just realised that you said prone leg raise not supine. Did you mean lying on my back testing h/s length because that's what i've just done.

Also i've just kinda grown up assuming that the dominant side is stronger and less flexible without really thinking about it. Could part of my differences be attributed to this as well as to more serious issues?

Thanks