As someone who has faction-quested a lizard necro to max ally with all the old world factions, I can assure you the kill hits are incorrect. Commons mobs usually give +1/kill. The negative hits usually start at -10 and can be much higher. The faction scale is correct as I have tested numbers from max scowling and using quests that give +1 to count thresholds.
For example just killed this dude:
https://wiki.project1999.com/Shondo_Billin
4k times (yes I counted) to go from faction could not get any worse to cannot get any better.
His wiki entry showed faction as +10 per kill but it was really +1 using a 4k scale.
His entry also showed -30 to factions per kill which were tested as accurate with a 4k total scale.