The difficulty level for the power grind to 200-550 is entirely flat. You can set modifiers such that you rarely have any spike in power delta the entire way through rarely have to put on more than a couple negative modifiers.
Conquests do vary a bit in terms of difficulty, by in my experience they are not overly difficult so long and you take your time.
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A lot players don't know this. I do/learned but the modifiers still take away the casual fun and increase difficulty in a way that is making this game unenjoyable really unplayable for almost all and player count reflects this.