Currently many people are running builds with 60+ hp. The hard cap essentially means that we have to shoot other targets usually 5+ times and only if we are landing shots that breach the 15 dmg threshold in the first place. Most of the time that doesn't happen.
HR are good at pulling the heat of regular range, off infantry. Currently we are such a low threat that people basically only kill us out of spite, or to shut down our horse which is a far greater threat than the weapons we are carrying.
The damage cap doesn't dissuade the HR players from playing, it just makes us considerably less effective at dealing with our primary targets, cav and other range as well as low armour agi players. We are a covering screen for out team, and currently we may as well just take shields and ram people.
I propose that the hard cap be removed completely. It isn't having a positive effect on game play and even the people on the receiving end of our pewpew are beginning to feel pangs of empathy for our miserable plight.
If we could have a dmg cap of 20-25 on body shots while leaving head shots alone I'd be for it. It would make our lives harder but not impossible. As it stands though it's just a terrible idea.