at 1k you dont need two archons. Also they dont have any defensive upgrades (no shadowfield or clonefield, heck not even ghostplate) and will just die in combat as you can direct attacks towards them. Drop the venomblade one, and give the other a Shadowfield atleast.
Now base wyches alone cant do anything to MEQ (which is your standard enemy) Normally they just tarpit and hold a unit there, and the way they win is the Hekatrix w/ Agoniser. So if you drop the number to 8, you can add both a sargaent upgrade and an Agoniser.
The other thing I would do is if you can, get your hands on another Raider, drop the warrior squad down to 10 man (along with the weapons) and chance the shredder to a blaster, and put them in the raider. 20 warriors imho arent made for a mobile list, as they are just too slow to give the support that they need to get their points back. With what poitnts are left over from the change, you have several options. You could get the Archon more upgrades (like combat drugs would be #1) or more wyches, or even haywires on the wyches (another good choice)
The last thing Ill comment on is I would personally split the reavers into two squads. This is a personal preference, but it gives you two different targets that the opponent has to shoot at to get rid of them. Think of them more as annoyance units than an actual threat (which is what the 6 man is)