It is true that tracer rounds behave differently than normal rounds in real life. Tracer rounds usually have different composition, mass, aerodynamics and thus different ballistics.
I've read that during the Pacific air war the US Navy did an experiment to remove tracers from fighter planes. Supposedly this greatly improved accuracy, as the pilots were less influenced by the 'misbehaving' off-target tracer rounds.
However, I'm not sure if this is intended in FH2, it could be a bug.