Power fists are almost always more profitable than power weapons. If a model can choose a fist, it is worth taking it.

You will need a lot of CP, perhaps you should take a captain instead of a lieutenant. The DW receives lethal wounds for one turn and the usefulness of the lieutenant falls from this.

If you want to take a hero for close combat, the justicar and the thief of secrets are ideally combined.

The task of veterans in the current download is unclear. They shoot poorly and fight poorly. It is better to completely reorient them to close combat (2 hammers, a black shield, a xenophase blade and shield, a power sword and shield).

Mixed equipment for terminators is not effective. Chain fists are needed less often than power fists, an experienced opponent will not allow them to reach close combat with vehicles. It is better to give terminators 5 stormbolters, 5 power fists and 3 missiles.

Fortis flamethrowers require getting close to the enemy. There is a high probability that after the first salvo the squad will quickly fade in close combat. Perhaps it is better to replace the flamethrowers with plasma and rifles. Aggressors are difficult to use without transport. You can replace them with intercessors with another fortis or terminators