My first concern is about precincts which straddle demographic voting boundaries. If you'll look at fine-grain voter maps, you'll see a bright line delineating

My first concern is about precincts which straddle demographic voting boundaries. If you'll look at fine-grain voter maps, you'll see a bright line delineating urban vs rural voters, with the urban voting dominantly Leftist (they're not liberal by any means) and rural voting conservative; by drawing that boundary to include about 45% rural and 55% urban, you can "maximize competitiveness" in a way that assures the outcome will be almost always Leftist, while subjecting the dissenters to that outcome. Heck, make it 50/50, knowing that redistricting is rare and urban populations grow, and the distribution is allegedly fair and competitive...but with an assured political result.