A question on the Tinker-archetype, and Empower Spell-Like ability (and particularly Balefire Infusion):
Does the Empower-effect only apply to the damage from the Pulse, or also to the damage from the damage from the spell cast via Aether Spark?

It should really be the latter, otherwise you can get 27D6 fireballs that punch through immunities and resistances at level 9. The archetype is already crazy-good with any sort of Vizier-dip, because you can still get 18D6 fireballs 5+ times per day at 9th level that way, but there's a difference between strong blasting and brokenly devastating blasting.