Imperial Agent & Smuggler - Simple Questions and Answers

[Supa]

Question: For the "Experimental Explosives" talent...
-Talent increases AoE critical by 30% 2/2
-I would assume it's only Orbital and Suppressive Fire
-Does this work on... Corrosive Grenade? Fragmentation Grenade?

I'm getting tripped up in the wording of the skills, for example, Orbital Strike says...
-"Dealing 3559 elemental damage over 9 seconds to all enemies within 8 meters of the targeted area" ...while Fragmentation Grenade says...
-"Deals 1462 - 1813 kinetic damage to up to 5 enemies in an 8-meter radius"... and Corrosive Grenade says...
-"Spews acid in a 5-meter radius on impact, dealing 1716 internal damage over 21 seconds to up to 3 targets"

Anyone have any input on this? I am trying to decide if it's worth it to move 2 points from Efficient Engineering. Not sure if the word "radius" indicates it's an AoE... I assume that once Corrosive is on the three targets, the damage is done in internal/poison ticks.

Thanks