50pl Crusade roster

Hi everyone
Im not experienced player and trying my first crusade.
We have a 50pl limit, so I’am wondering about roster.
Typically we are playing incursion missions

++ Battalion Detachment 0CP ++

+ Configuration +

Army of Renown – Skitarii Veteran Cohort

Battle Size : 2. Incursion

Detachment Command Cost

Forge World Choice: Forge World: Mars

Gametype: Open

+ Stratagems +

List Stratagems: Charadon – Skitarii Veteran Cohort

Stratagem: Archeotech Specialist : Archeotech Specialist

+ HQ +

Skitarii Marshal : Relic: Exemplar’s Eternity, Warlord, Warlord Trait : Programmed Retreat

Tech-Priest Manipulus : Magnarail lance, Relic: Raiment of the Technomartyr

+ Troops +

Skitarii Rangers : Enhanced Data-Tether, Omnispex
. Ranger Alpha: Galvanic Rifle
. 16x Skitarii Ranger: 16x Galvanic Rifle
. 2x Skitarii Ranger : 2x Plasma Caliver
. Skitarii Ranger : Transuranic Arquebus

Skitarii Vanguards : Omnispex
. 3x Skitarii Vanguard: 3x Radium Carbine
. Skitarii Vanguard : Plasma Caliver
. Vanguard Alpha: Radium Carbine

Skitarii Vanguards : Omnispex
. 3x Skitarii Vanguard: 3x Radium Carbine
. Skitarii Vanguard : Plasma Caliver
. Vanguard Alpha: Radium Carbine

+ Elites +

Sicarian Ruststalkers
. Ruststalker Princeps : Artefactotum, Host of the Intermediary, Relic: Temporcopia, Warlord Trait : Firepoint Telemetry Cache
. 9x Sicarian Ruststalker : 9x Transonic Blades

+ Fast Attack +

Ironstrider Ballistarii
. Ironstrider Ballistarius: Twin Cognis Lascannon
. Ironstrider Ballistarius: Twin Cognis Lascannon

Pteraxii Sterylizors : Pteraxii Sterylizor Alpha
. 4x Pteraxii Sterylizor: 4x Phosphor torch, 4x Pteraxii Talons

Serberys Raiders : Serberys Raider Alpha
. 2x Serberys Raider: 2x Cavalry Sabre, 2x Clawed Limbs, 2x Galvanic Carbine

++ Total: ++

I have only 2 ironstrider model
Not sure that 5 pteraxii would work
Special weapon for skitarii – because its have no effect on pl
Not sure what to do with serberys in incursion table size

50pl Crusade roster