For anyone that needs a functioning large map; I have a setting that I found to be a good middle ground between not being too wide (like the vanilla map) and being able to have a good fit for the core worlds; and it is large, amply large for a lot of factions, and near endless power struggle gameplay.
"sectorWidth":240000,
"sectorHeight":180000,
"AdjustedSectorConstellationCount":300,
"AdjustedSectorConstellationSize":1000,
"AdjustedSectorConstellationCellSize":10,
"sectorConstellationRemnantMin":100,
"sectorConstellationRemnantMax":150,
"sectorConstellationRemnantSkipProb":0,
"sectorRemnantPresenceLow":0,
"sectorRemnantPresenceMed":1,
"sectorConstellationRuinsMin":100,
"sectorConstellationRuinsMax":150,
"sectorDerelictMotherships":10,
"sectorDerelictCryosleepers":10,
"sectorCoronalTaps":10,
"minNonCoreGatesInSectorMod":50,
"maxNonCoreGatesInSectorMod":100,