Suggestion instead of Lerk's spike tracers.

Paajtor

Why do Lerk-spikes have tracers anyway?
The Lerk's spikes are pretty much insta-hit with no gravitational penalty, so there shouldn't be a need for tracerrounds.
So for an evolving lifeform, it makes no sense to even "research" it...that's not how evolution works.

Instead, how about giving the Lerk's spike-nozzles a faint glow when being used?
A marine will have to start searching for it, in far away dark corners.
Makes the confrontation much more fun and balanced imo...because he's hunting a stealthy lifeform.

Draptor

I'd be more in favor of having tracers only go X meters. Like the blur effect only extends about 2-3 (random number) meters from the "barrel" of the gun. Sort of a halfway compromise between the old and new systems.

Or, even the opposite- the tracer effect kicks in the last couple meters before hitting the target. Long enough to give you a bearing on which direction the lerk is, but still forcing the Marines to hunt it.