Well as a dps in rakata/columi, I have almost 19k HP, so a 4k heal doesn't do much more for me than for you. It's even worse since the +15% health bonus is useless as a dps when it's pretty good for a tank.
Like I said before, any dps/heal doing pve have at least 17-18k hp, there's no way a 4k medpack will heal a third of anyone's lifebar. Also it doesn't take a global cooldown.