More caster makes the steering want to go straight more. It also makes it more stable, needing less input to drive straight. Less caster makes the steering faster, turning quicker. But it also makes the steering less stable and not as happy to track straight down the road.Out of curiosity, setting caster to 5 degrees will do what exactly? Does it eliminate or aid with any of the off center vagueness I am still feeling a small amount of?
5 degrees of caster is generally a good compromise for caster, decent steering response while still being stable. So people with large tires or other special needs run upwards of 7 degrees caster. But for most around 5 degrees seems to be the happy number.