Never seen the care package glitch, but I don't play free for all. I normally stay on Mercenary Team Deathmatch or whatever it is.

Right now I /think/ I am using:
M4A1 w/ ACOG and FMJ
Perk 1: Bling Pro
Perk 2: Hardline Pro (Don't know what else to use for now)
Perk 3: Steady Aim

I'm wondering if I should prestige right away after getting to level 70 for the first time.