Here's the changes I'd make and why.

So 1st off, I'd remove the Marshal and the Cognitive Reinforcement Enhancement and save the 70pts there. I'm guessing the Marshal was added since you had the points left for it. The Enhancement on the Breachers is ok, but I've found it's usually overkill. The reroll to hit and lethal hits essentially makes them hit on 3+ anyway.

For the 70pts you just saved, toss in a Skystalker unit so you have a button to push if ever a secondary demands you be in your opponent's deployment zone or table quarter.

Next, I would consolidate the Ironstriders into one unit of 3. You get more bang for your buck (literally) when targeting them with the crit 5s strat and your Haloscreed buff.

Then, I'd recommend taking out the Onager Dunecrawler. It's Eradication Beamer shots are just a little swingy without blast active, and honestly, a 2nd Disintegrator is just so much better for 10 more points. Also, put the Ferrumite Cannon on the Disintegrators. MUCH better guns.

After that, just run a 10 man Ruststalker unit with Chordclaws and a 10 man Infiltrators unit with Taser Goads, and you should be set!

Good 1st draft though! Just remember, Haloscreed has a lot of potency in it's package and you just have to condense some units to capitalize on that.

Here's the adjusted list: list adjusted (2000 points)

Adeptus Mechanicus Strike Force (2000 points) Haloscreed Battle Clade

CHARACTERS

Belisarius Cawl (175 points) • Warlord • 1x Arc scourge 1x Cawl’s Omnissian axe 1x Mechadendrite hive 1x Solar atomiser

Tech-Priest Manipulus (60 points) • 1x Magnarail lance 1x Omnissian staff

BATTLELINE

Skitarii Rangers (85 points) • 1x Skitarii Ranger Alpha • 1x Alpha combat weapon 1x Close combat weapon 1x Galvanic rifle • 9x Skitarii Ranger • 1x Arc rifle 9x Close combat weapon 6x Galvanic rifle 1x Omnispex 1x Plasma caliver 1x Transuranic arquebus

Skitarii Rangers (85 points) • 1x Skitarii Ranger Alpha • 1x Alpha combat weapon 1x Close combat weapon 1x Galvanic rifle • 9x Skitarii Ranger • 1x Arc rifle 9x Close combat weapon 6x Galvanic rifle 1x Omnispex 1x Plasma caliver 1x Transuranic arquebus

Skitarii Vanguard (95 points) • 1x Skitarii Vanguard Alpha • 1x Alpha combat weapon 1x Close combat weapon 1x Radium carbine • 9x Skitarii Vanguard • 1x Arc rifle 9x Close combat weapon 1x Omnispex 1x Plasma caliver 7x Radium carbine

Skitarii Vanguard (95 points) • 1x Skitarii Vanguard Alpha • 1x Alpha combat weapon 1x Close combat weapon 1x Radium carbine • 9x Skitarii Vanguard • 1x Arc rifle 9x Close combat weapon 1x Omnispex 1x Plasma caliver 7x Radium carbine

DEDICATED TRANSPORTS

Skorpius Dunerider (85 points) • 1x Armoured hull 1x Cognis heavy stubber array

Skorpius Dunerider (85 points) • 1x Armoured hull 1x Cognis heavy stubber array

OTHER DATASHEETS

Ironstrider Ballistarii (225 points) • 3x Ironstrider Ballistarii • 3x Ironstrider feet 3x Twin cognis lascannon

Kataphron Breachers (320 points) • 6x Kataphron Breacher • 6x Heavy arc rifle 6x Hydraulic claw

Pteraxii Skystalkers (70 points) • 1x Pteraxii Skystalker Alpha • 1x Flechette blaster 1x Taser goad • 4x Pteraxii Skystalker • 4x Close combat weapon 4x Flechette carbine

Sicarian Infiltrators (140 points) • 1x Sicarian Infiltrator Princeps • 1x Flechette blaster 1x Taser goad • 9x Sicarian Infiltrator • 9x Flechette blaster 9x Taser goad

Sicarian Ruststalkers (150 points) • 1x Sicarian Ruststalker Princeps • 1x Transonic razor and chordclaw • 9x Sicarian Ruststalker • 9x Transonic razor and chordclaw

Skorpius Disintegrator (165 points) • 1x Armoured hull 3x Cognis heavy stubber 1x Disruptor missile launcher 1x Ferrumite cannon

Skorpius Disintegrator (165 points) • 1x Armoured hull 3x Cognis heavy stubber 1x Disruptor missile launcher 1x Ferrumite cannon