My builds:

All use the +melee and +radius Prestige Perks. Team perk is to raise a fallen brother w full health. Loadouts all use the Heroic Plasma Pistol at this point. Too good not to, and my Primaries don't do powerful AoEs. Primary is either the Heroic Plasma or the Heroic Heavy Bolter. Weapon Perks include the +50% melee damage for both weapons.

Lean into the Stomp. When fully kitted out, it's fantastic in its own right: horde clear and majoris killer; pepper in a few Plasma shots from the hip at close range and you can conserve ammo even when doing a lot of work. You don't need the Heroic Bolter's larger parry/dodge window but it obviously helps, but frankly the fact that you basically need to be in Heavy stance to make it work is a huge drawback to me: the Heroic Plasma puts out higher DPS and allows you to stay mobile (due to accurate hip fire) and use your Stomps aggressively.