Um, am I the only one in here seeing this or did you just say you did 50 damage on one hit, naturally, at level 4? Which crits to 100? Am I reading that right, or did you do a lot of leveling in between that you failed to mention.

Because if that's the case than the DM telling you your items are overpowered is just fact. You say he threatens to "overnerf" your weapons or that he spent the rest of the campaign using "overbuffed" creatures but that just sounds like he's trying to avoid having you one-shot everything, which is exactly what I would do in the same situation.

I don't know, like, I want to sympathize with you here but I feel like I'm hearing one very biased side of this story.