Competitive 1850 list

My local gaming group consists of Tau, Orks, Vanilla Marines and Necrons. Of these, I mainly end up playing against the Tau and Ork armies so take that into account when commenting on the list.

Archon (warlord)-Huskblade, PGL, Combat Drugs and Shadow Field 170 pts

Troops-

10 man warrior squad (1 splinter cannon) on a raider w/ splinter racks and night shield X2 180 pts each

4 wyches w/ a hekatrix (agoniser) all with haywire grenades on a venom w/ extra splinter canon 155 pts

Elites

4 Incubi in a venom w/ extra splinter canon 153 pts (warlord will be hanging out with these guys)

Fast attack

6 Reaver jet bikes w/ 2 heatlances 156 pts

Heavy Support

1 Ravager w/ nightshields 115 pts

1 voidraven bomber w/ monoscythe missle 155 pts

Allied attachment

HQ- Autarch (solitare) Jetbike, laser lance, fusion gun, Motlg 145 pts

Troops- 10 man Guardian squad w/ Bright Lance heavy support in a Wave Serpant with TL scatter laser, Shurkien cannon and holofields 255 pts

Elites- 7 striking scorpions with an Exarch w/ scorpion's claw and crushing blow 186 pts

My concerns with this list are not having enough elites in assault and tank busting. I wouldn't be opposed to dropping something for either a couple more incubi and a raider for the Archon or maybe adding a few more scorpions and another wave serpant. I've got mixed feels about bringing the wyches as they have not had good results in the last couple of matches I've played (mostly dying horrendous deaths due to overwatch). They would be the unit I drop. Questions and comments welcomed.