OP, I am fairly sure I played a game with you a few days ago. You were a TGI with Javelin iirc, I seem to recall I was some sort of Infiltrator too, perhaps QFI with Indra? This was on dagger hazard. We came in first and second, and I did not nuke spawns 
As far as that match was concerned, I was the host, using geth scanner (huge help on that map), with a pretty strong kit-weapon combo. My feeling was that you were playing a more defensively oriented game, preferring to pick safe spots over going aggressively for kills? If that's the case, I would suggest watching some videos of good gold solos, as you might discover some good RHA/shooting places you didn't think of, or some good routes around the map - I certainly discovered a lot of useful cover I had dismissed at first!
Getting a feel for likely spawn points will undoubtedly help too.
For what is worth, I remember our match because I thought you were a very good player! You picked your targets well, conserved your resources, played objective waves really well, stuck with the team, went in for revives, and generally put teamplay over your own score
nothing wrong in wanting to score higher of course! But IMO you are a very good job player already 
Also, a thing I personally encounter a lot in pugs is that one guy who shows up with a CP score in the hundreds of thousands and just demolishes everything. So yeah, not gonna be easy outscoring him.
Hei, now, I resent that! 
Actually, I am a fairly defensive-minded, slow player myself; if I end up demolishing everything by myself, it's usually a bad sign as far as the rest of the team is concerned