In PVP, anti-devil is your best friend since it crits a lot. People usually use three kinds of skills when killing stuff: anti-devil, arrow combo, and berserker/strong bow combined with elemental imbue. I personally use berserker, anti-devil, arrow combo in that order.
Berserker arrow takes around 1.5x the chargeup of anti-devil, which isn't really that long. I don't have strong bow yet, but from the looks if it, it takes a REALLLY long time to charge up. Maybe 3+ seconds.
Black hawk you need at level 1 or so. And buying astrals is probably a scam, so don't do it
