Since the cable stop at the hub end is part of the hub assembly which moves with the wheel when adjusting chain slack, why will shifting or shift cable tension need to be adjusted as well?
When adjusting chain slack, check while you're doing it by rotating the crank through a couple of revolutions. Neither the chainring nor the drive cog are perfectly round and static adjustment at any one point may mean too loose or too tight at other parts of pedal revolutions.