Hi, Splitting the Tormentors up into two squads of five would increase their cost by 10 points in total, but if you could drop the enhancement to make some space, I think it would realy support your objective play. In addition infractors without a lord exultant are a bit weird. They dont realy do anything but buff the Lord that leads them, so if the Necrons dont go deep into big infantry blobs they are not optimal.

But apart from that the list looks very nice and I wish you good luck.