The problem with life extension is similar to the problem with bravery. You can't light shield over it. You can only use 1 buff at a time, so only invest points into one (I suggest using light shield).
I covered this already but you don't need max sleep to get the effect you need. Sleep bind only requires level 2 sleep, 3 if you want to give yourself a little more breathing room. Maxing sleep is a waste of a point and of mana.
Once again, I don't believe max light shield is needed. At max you're spending too much mana on it in my opinion, and 2 points in it is enough to outlast a nado. If you really want to max it though, the only use I could see is to try and stall while a sieg uses magic defense.
I STRONGLY recommend you invest the spare points into Light of Healing. It really is that useful. If you're that set on not healing though, you could put the spare points holy spirit, and a point in concentrate.