The balance of difficulty between game modes is WAY off

Anyone else feel the balance between normal chapters and sky tower is way off in this game? I recently cleared 475 in the sky tower after a few days worth of attempts and unlocked chapters 42 and 43 of the campaign, and like always I breezed straight through them, even with AWFUL luck on skills.

I think It would be refreshing to actually be stuck trying to beat a campaign level for once instead of always just bashing your head against sky tower until you finally beat it.