Yes playtesting and gathering data is definetely a good idea, before tweaking something based off one comment! About the unpredictability, I see that it works for the dreadful setting and could see a scenario where you keep it like this without it being a bad thing. If you find the issue and fix it you could still keep that unreliability by choice. What you could even do is: keep the unreliability for the knife but have it changed for the gun. So that the gun gives players more control over the situation. Then when players find more ammo they will cheer and thank the gods of sol and luna, because the gun gives them a sense of security, while the knife remains the "sloppy" alternative. Then limit the ammo drops even more and you'll have desperate players biting their nails with stress haha.