Duno your take on malys, but i dont know Newcrons, as do they poses psychic powers or nay. If they dont, i'd just go with Standard archon. Further: you have 3 haems and a Malys, but only 3 free space in your transports. Something is on foot?. That can save you some points.
if you go with the razorwing, the entire enemy army WILL have saving throws against them, so why not go to reroll wounds for an extra 5 pts per missile?
Duno what can you do with the monolith, glance it to death with multi assault wyches?
The rest i find it to be fitting for a DE army.
No, dont switch out the incubi for warriors. I'll do mathhammer for t4 4+ w1
Incubi with Standard Archon: 2+3=5 unsaveable wounds exc. with invuls.
Warriors with blaster and venom two cannons: 2.66+0.6or1.33+0.55 3.81 or 4.54 unsaved!
as you can see i counted in the venom for the warriors, but not for the incubi.
Thats just my subjective opinion