I'd say give the Inq Lord a psycannon as your retinue is set up for long range. Switch out the Familiar for a Sage(to up your BS) and forget the psychic powers, most aren't even useful. Only one I like is scourging and thats for a CC Inq.
Personally I'd say use another HB or PC instead of the multimelta. Better range and you need more anti-horde stuff than anti-tank. You have plenty of anti-tank in your IST squads.
I'd say drop the Armored Fist if you aren't taking more than one to take a Russ or Sentinels. Instead use the points from it to put two of your IST squads in chimeras. And make sure you give the chimeras EA.
And to Shane, that's using IST, if you use pure or mainly GKs its even fewer models.
Jake