Well... I had the exact same problem last night with the XPR-50. I kept on getting to 4 kills and dying a total BS death! It was making me rage pretty bad! Anyway after getting 1 bloodthirsty in like 10 games I decided to try the NOOBIEST THING EVER
Assault shield Sniper of choice with dual band
Flak jacket Cold blooded Tac mask
Overkill Shock charge x 2
Basically I was sitting in a corner of the map in free for all headglitching behind my shield. I got the bloodthirsties in about 7 matches and omg the rage I was inducing on people was epic! EPIC! I felt horrible though because it is really nooby.
TL;dr a mans gotta do what a mans gotta do!
Noob or not, if it gets me gold I dont care! I like you're thinking Mr LoveFist. Thnx
Finally got thr dsr all golded up! Played Dom on Nuketown and just lay down and camped it up by the bunker in the back garden. Got 2 in 1 round then Nuketown came up again 3 games later . . . rinse & repeat! Right, Ballista . . .