As a Redeye main and a Grandeur and Caulden/1911 player g75 loadout, my advice is to use the IR alot, and iron sights. Sometimes even if you are unable to get to shoot the enemy team, marking them for your team with the goggles helps a great deal. I tend to use the IR and pan left and right looking for white and movement. Hiding behind the smoke is a great strategy, but one I like to do is throw it in choke points and hide far away, then pick off enemies as they walk around the smoke or try to knife me in there, even though I’m probably right behind them >:). If you are low on health smoking(no not the cancer causing kind) and running away to heal can save your life.
Another advice is that you might be like me and have colorblindness, so the red markers are nigh impossible to see. If so I suggest you use the guide here: http://forums.dirtybomb.nexon.net/discussion/18416/colourblind-tutorial-guide
Even if you are not colorblind, changing the color of the markers and enemy health, might still be helpful. That being said, I’m not a sniper, but more of a mid-range aggressive marksman when it comes to Redeye who will sometimes try to snipe if the opportunity arises and a dern Kira, my achilles heel, is not present. Also Redeye can be very useful for teammates, like guarding delivery points in objective/stopwatch, or covering your team while they ev repair. Be mindful of your team as well, they do not have IR goggles and the smoke can obstruct them. Hope that helps.