apparently, encounters that do very little dmg ( PoB's first hit) do not recharge stealth... an that's a good thing! imagine using shadow strike (very little dmg, recharges your stealth bar) and actually using up your charge of one with the shadows(recharges your stealth bar). wouldn't be nice..
it's 2k. your 2 daggers are added. i use bilethorn enchant so i know what i'm talking about hopefully ( i got 1600-1800 wep dmg and i make 200 ticks at 14% poison after 4 sec)