Great will power QT. I also like the fact that you lightened up the weight on the squats and went for reps with the sciatic acting up. You are very strong on the bench BTW.
Something to think about on leg training:
The quads usually respond to high reps pretty well. It allows a lot of blood flow to the area, but hams seem to respond better to lower reps...8 or so. They are about as FT fiber as we have in our body. You might want to drop the reps a little. I am just suggesting this, not recommending it as I don't know what exactly you are training for.
Do you do any specific work for the lower back? It could be that the sciatic is acting up because the lower back may be weak relative to the abdominals. When I was bodybuilding, I tended not to do too much lower back work and I always had a sciatic problem. When I started powerlifting, my back has not hurt since. I understand that a weak lower back is not the main reason the nerve gets pinched, but it does contribute to it.
3 muscular reasons for lower back pain:
1. Weak abs
2. Weak lower back
3. Hamstrings are too tight.
It could be the 3rd one in your case as the direct ham work you do, along with the plyos and the training could also contribute to tight hamstrings. You might want to do some PNF and also some stretching after you train legs.