Chunky salsa is more about the shockwave/explosion itself being bounced than fragments (in which case, it would only work on frag grenades, not HE's)... For stun grenades it would be the sound being echoed over and over and enhanced that way.
Anyhow, that's how the RAW work as far as I understand it. But I agree, it's waaaaay too excessive.
I'd just like to know ahead of time how we want this to work, so I know which grenade to pick when it's neccesary.
And, uhm, Kour, you gonna move... or you still waiting on Dragonfly?