Heat-biased to stack Cascadia Flare more quickly and because you'll cap your Viral stacks in no time anyway. Incarnon hits almost 700k burst DPS with everything stacked, and that's not counting the +crit evolution (which ups the crit chance to nearly 100%). 23 meters of beam, 30 with Moonrise Velocity on Evolution III (though that means you can't increase the ammo max or magazine size on reload). Do note that the chain length can't be increased, so while the enemies don't need to be close to you, they do need to be close to each other.