Just a question, do you have the models yet? I remember making the mistake of assembling my command squad like the picture.
To have the Emperor's Fist Armoured Company need at least one tech-priest. Also, make sure you definitely get pask as a tank commander.
Also, since the Emperor's Fist Armoured Company is a core choice, you could take the platoon as an auxiliary choice and become a cadian army.
You can pick up some heavy weapons (autocannons, lascannons, etc.) and move and fire. Also the platoon gets move through cover when within 9" of mandatory sentinel and they also reroll ones to hit with lasguns.
This would buff the strength of your platoon greatly and eliminate the useless veteran squad.
Also, it means you wouldn't need the veterans who are not really playing to their strengths with grenade launchers and no transport.
tl;dr get the cadian datasheet and consider running a cadian force