So theres a few topics like this but thought id address each aspect of pred-stealth issues I think we have.
Footsteps -
Fine for zerker, Maybe a quieter for the other two when on ground, and quieter for all when in trees. Until AVP2010 you didnt hear elephant stomping from any pred, although they were all zerker types so sorta makes sense, but yeah the hunter and scout should be a little lighter on the stomping.
Noises - I think noises are mental on this, it constantly gives away the predators position. Maybe change it to so the predator only makes the noises either by command of the player (to taunt) or… after sitting still for more than 10 seconds.
The Active Cammo - Close range im actually fine with this, looks like the movies, But long range? Its actually easier to see a cloaked pred than it is NPCs. From long range its just a perfect predator shaped outline running around. (thats running on highest graphics). If anything it HIGHLIGHTS the predator, rather than hides it.
I mean sometimes its harder to see an uncloaked pred running about than a cloaked one. Which is a bit daft, but again, only at long ranges.