Trophies should be even out

[Reasonable]

I think the spread is okay, it's what they're for that I don't always get - for example, as you say, there are some bronze that are harder to get than silver, that seems unbalanced.

I guess it's hard to ensure that everyone will find a bronze equally easy and a silver more challenging - after all what I find hard you might find easy, but sometimes the challenge does seem unbalanced to the Trophy value.