Hey there,
first: this is an unbound list (most of the times you want a battle-forged list outside of narrative fun games) and you got 2007 points in there (so 7 more points than you should have).
Now my two cents:
I agree in nearly every point that Chippen mentioned, but I don't think Reavers are in every situation bad, but for a tarpit they are really pricy. You could go for Wyches of 10 in Raiders for a tarpit. Just don't charge anything with an auto hitting weapon. Trust me
.
Furthermore you could swap the Cluster Caltrops for Grav-talons. Most of the time you will charge, but a fallback move will always have a lower count than your charges.
Another thing is, that the
DL can't shoot at all, if the Tantalus advances. Also the rifles on the Warriors can't. If you want more anti tank, then go for Ravager (anti tank only) or Razorwing Jetfighter (mix between anti tank and anti infantry).
I would also go for the Blaster party bus that Chipper mentioned (if you want to field a Tantalus at all). It makes a really valid Vanguard Detachment. If you really want to field Incubi, then maybe go for 9x + 10x in Raiders with
DL and Drazar (he is a valid
HQ choice and buffs the Incubi in the first 2 turns really well). I would drop the Agonizer on the Arena Champion (he is already hitting at S4,
AP -1 and that should be a 4+ to wound in most of the situations) and use them as a distraction carnifex. For anti tank I would field Ravager or Reaper (if you already go for
FW why not more
). After that I would fill up the rest with Blaster Warriors in Venoms (for your anti horde dakka).