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Points Level: 1,500

Formations
-Battle Demi Company
-Ravenwing Strike Force

Headquarters
Sammael

Interogator-Chaplain
-Bike, Shroud of Heroes

Troops
Tactical Squad (Min Size)
-Flamer
Drop Pod

Tactical Squad (Min Size)
-Flamer

Tactical Squad (Min Size)
-Melta

Fast Attack
Assault Squad (Min Size)
-2x Flamer
Razorback
-TL Heavybolter

Ravenwing Black Knights (Knights x5, Huntmaster)

Ravenwing Black Knights (Knights x5, Huntmaster)

Ravenwing Darkshroud

Heavy Support
Devastator Squad (Min Size)
-Grav-cannon w/ Grav-amp x4

Tactics and Ideas

The main threats in this list are going to be the Black Knights backed up by the Darkshroud and I'm thinking that the Sammael and the Interrogator-Chaplain will each lead their own unit up the board. Two of the minimum strength tactical squads will hang back to hold objectives and depending on what threats are up the board the drop pod can bring either a melta or a flamer squad into the enemy backfield. The Razorback with the assault squad will probably want to advance up with the Knights giving some covering fire or acting as mobile cover by popping smoke within range of the Darkshroud. The Devastators will anchor a flank after advancing up to keep a primary threat within range.

My biggest question is if the two threats I have will be enough given how fragile the rest of the list is.

The other thing to note is that this is designed to be a friendly list. I know I could just run a Ravenwing Strike Force and save a ton of points.

Ok, I think we need to make a few tweeks:
Firstly, you can't take an Interrogator Chaplain in a Demi-Company, so we'll have to knock him down to a Chaplain.
Next, we don't have any free Fast Attack slots to have the Drop Pod as a non-dedicated vehicle, so we're going to have to bite the bullet and assign it to a unit. The three options being the Assault Squad (why drop pod one flamer when you can drop pod two?), the Melta Tac Squad (with only a single shot, this will not be reliable to take out a tank) or the Devastator Squad (this is the most effective choice - the Grav can still be used at the fewer number of shots the turn they disembark, and will delete pretty much any unit with a half-decent armour save on turn 1). I've given it to the Assault Squad in my example below as I don't class Grav-Cannons-in-a-Drop-Pod as "friendly".
Next up, we can upgrade one of the Black Knights units into a RW Command Squad. Combining the points saved from the Int.Chap. downgrade, and from dropping Shroud of Heroes, we can make one BK into an Apothecary.

Battle Demi-Company
Chaplain - Bike

Tactical Squad (5) - Flamer
Razorback - TL Heavybolter

Tactical Squad (5) - Flamer

Tactical Squad (5) - Meltagun

Assault Squad (5) - 2x Flamer
Drop Pod

Devastator Squad (5) - 4x Grav-cannon w/ Grav-amp

Ravenwing Strike Force
Sammael

Ravenwing Command Squad (6) - Apothecary.

Ravenwing Black Knights (6 including Huntmaster)

Ravenwing Darkshroud

Now, a note on the Grav Devs - they are going to attract fire like there's no next Wednesday, and with no ablative wounds (i.e. extra squad members) each casualty is going to hurt (in both points cost and firepower). So something to consider is to take one or two of the cannons out of the unit, and use the points either on more transports (a drop pod and combi-melta for the melta tacs perhaps) or simply putting them into the tactical squads (instead of the special weapon).
Another thing to ponder is the chronic lack of anti-tank - anything that can survive plasma talons is going to give you problems.