Grenade PvE DPS Static/Mightstack
Only thing you’re missing out on are the 6 orbs, i.e. 12% crit dmg and 84 Precision. In return you get a substantial boost to Power and condition damage. How much exactly depends on how many stacks you keep up, but at 35 Power/cndition dmage per stack you’d be ahead regarding Power with 4 stacks on you already.
Grenades do awesome direct damage and awesome condition damage. So, stacking might is the most powerful way to play them imo.