Two mechanics used in Witcher 3 that I thought could be beneficial added to the game:
- Hill Sliding
Whenever possible Geralt from Riva does not fall down hills if not absolutely necessarry. He slides down. Taking no fall-damage. This would solve the problem in this game where - whenever you are near a slope - you fly-glitch down a hill and die.
- Balanced Weight System
You mentioned that you are experimenting with new weight systems. One way of doing so would be the one from Witcher 3.
Armor and weapons weight a ton (~5), a few crafting materials a little (0-2) and edebles literaly nothing (0). All in all there is to say that players love horting when they don't know when they going to need those materials.