Alright guys Round 2:

Seismic Torps is a torpedo so it should interact with Guidance chips (specifically when rolling for damage on another ship after the obstacle is removed). However Seismic torps are an action, does this count as an attack? e.g can you use seismic torps with chips to almost guarantee damage gets passed (unless you roll a pesky focus).

No this is clearly no an attack, you said it, this is an action. And the attack dice you roll are not attack roll at all.

Guidance Chip apply to Secondary Weapon attack anyway, and you are clearly not during an attack of a secondary weapon.

Its not an attack. Just because something sits on torps slot doesnt make it a weapon, Extra Munitions rings a bell?

even if it was an attack, it wouldnt do anything because you arent rolling the dice.

Quite frankly im glad its not an attack, both because i can still fire after blowing up a rock but also because then they'd probably slap in some BS about "you gotta hit the rock to blow it up!" which is no bueno.