Those big city districts are already gerrymandered for the Democrats. They can run up 90 point margins in them
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90 points seems to be the foundation - some go over 110 points.
This is what has to be countered somehow. else they will always win when it matters. and Dems will, sooner or later, succeed in achieving the dictatorial tyranny they so crave.
You aren’t following.
Let me help you with a working example:
Here are the maps for Indiana in 2022.
https://projects.fivethirtyeight.com/redistricting-2022-maps/indiana/
The 7th District has a 37 point Democrat lean. It’s also where liberal Indianapolis is. The Dems can cheat all that they want there. They could run up 100% of the vote. That doesn’t get them any more than what they already would have won. 1 Congressional seat.
Every other district except for the 1st is a Solid Republican Seat. There aren’t enough urban controlled Democrat areas in any one of them for the Rats to cheat enough to win them.
In a wave year, the 1st can fall to the GOP, depending on what the national swing is.
Unlike a Presidential election, swinging a few thousand votes doesn’t change the outcome in a State. There are actually 435 separate elections going on at once. The vast majority of them are in districts that the GOP is going to control the vote counting in.