JG tracer/mock suppressors have trouble lighting every bb in full auto of you have a decent rof. There's tons of literature and yotuube videos on most of the suppressor units out there and they all share many of the same problems.
If you do go that route, the TM unit is the only way to go. It costs an arm and a leg but I have owned a variety of tracers, and the TM unit is made to such a higher standard that it makes a noticable difference in the brightness and the longevity of the bb's illumination. And no matter how fast you're shooting, that unit will light up every single shot.
As far as BBs go, Bio tracer rounds suck, they light up in some place, and stay dark in others, the consistency is not there. Most sites allow you to use normal tracer rounds so make sure you use them. I've actually had the most success with the Airsoft Elite tracers. Also, green is the only color thats actually useful. Super bright, looks amazing, and red/orange are nowhere near as easy to see. That may be more useful for concealing your position, but you better believe that people aren't going to call their hits every time if they can get away with it.