AndyD said:
I kept trying to get into that game, and I was in for a while before you left. I got a couple of those ribbons too. It is a very good setup, surprisingly so.
I later played S&D only game too, and those also work very well.
Any tips on using C4? I cant for the life of me get more than 1-2 kills per round.
Cluster two or three together in one spot. Avoid places that get showered with grenades (or rockets) frequently, any nearby explosion will set off the C4 and it'll be wasted. Use back-alleys, routes you yourself would use to sneak up and flank unnoticed. If you have to place them in the line to an objective, try placing them behind the corner, not in front (e.g. in Radec S&R, place them inside the room with the propaganda receptacle, and not in the room people race through to get there).
Also try placing them not on the floor, but roughly head high on walls or in door frames.
Favourite spots for C4 are the corners on the upper-level balcony on Radec Academy, the narrow, long back-alleys on Salamun Market, and the side of the column in the central room on Tharsis Depot.
You can also just lob them into a cluster of enemies. It can be abused to work similar to a grenade, but it'll take longer to detonate, so you'll most likely be down first.
Also note that you can actually throw them from ground level up onto the first floor. E.g. if you play ISA S&D defence on Radec Academy, you can lob C4 from the ground level near the spawn point up and through the breach in the wall near the objectives.