what are you looking for in an army??? this list seems very sparatic and can have alot done to it to make it more competitive.
First off whats the purpose of the Archon??? You can easily get a Succubus for cheaper, and she will be just as efficient. Or if your set on an Archon, a huskblade is very expensive option for such a low points costs game. Maybe try Archon, Agoniser, Shadowfield instead and save you 25 pts (10 from the soul trap, 15 from the huskblade)???
The Warrior squads are nice, but I find that you gain more from them by dropping the splinter racks and adding in a blaster instead. The duality given to the unit is nice, but the real reason is that giving you one S8 AP2 hit and being able to play some shenannigans with wound allocation and put that Instant Death wound on an important target helps immensely.
Whats the purpose of the 6 wyches other than to roll with the Archon??? 6 wyches arent going to do alot, but Ill get back to these once we free up some points
Heavy support. Now here is where you have a ton of points held up. A razorwing is nice, dont get me wrong, but you already have a ton of AI brought to you by your two raider squads, so whats the purpose??? Also considering that the plane must start in reserve, you wont have its firepower until atleast T2, maybe even later. Your best bet is a Ravager. its cheaper, higher AV, better overall in effectiveness, and its starts on the board.
Now with all those freed up points, we can up the wyches to actually make them useable. Give them a hekatrix w/ PGL (for stealth against shooting and overwatch) and a venom blade. We now got this as the list.
110- Archon w/ Agoniser, Shadowfield
175- 10 Warriors w/ Blaster, Splinter Cannon; Raider
175- 10 Warriors w/ Blaster, Splinter Cannon; Raider
175- 9 Wyches, Hekatrix w/ Phantasm Grenade Launcher, Venom Blade; Raider
115- Ravager