First off I'm thinking, where's the Succubus going to go? There's no room for her anywhere. Secondly, I'm thinking that if you drop all those vehicle upgrades (NS off everything, but i still use SR, tc) and downgrade the agonisers to power Spears (such a small squad of wyches will die second round if they don't sweeping advance and otherwise work the same as agonisers) and the dark lances to splinter cannons (you should be moving with your warriors else they won't get that jink save) you will have 150 points or so to play around with, maybe a true born squad or so. I'm not an expert against necrons but another squad will serve you much better than those upgrades, that's just standard list advice. Otherwise your list looks quite good, although personally I've had terrible luck with wyches this edition.
Darkness falls across the land, the midnight hour is close at hand, creatures crawl in search of blood, to terrorize y'alls neighbourhood.
And whosoever shall be found, without the soul for getting down, must stand and face the hounds of hell, and rot inside a corpse's shell.