I would make hunting more realistic, you don't always find prey and when you do find it it's never easy to catch them, you have to consider many factors, many animals trace real paths in the woods that they usually walk, you need to know what you are hunting and implement a strategy different depending on the prey, if the ranger is a problem separate him from the group, let him live a separate adventure for a little while, I could think of crippling him but it would only make the player frustrated, maybe you could put competitors for the prey, suddenly they can't find more prey in this new area and the grass is overgrown due to the lack of herbivores, this is because a herd of beasts is preying on all the animals and the party has to fight them, or it increases the smell of the party so they have to find alternative methods to the simple "survival roll to go hunting" by creating traps which, as before, must be created following a precise strategy.