I would say -These are all how I design and prefer-
Vertical: (+)4.5, (-)1.0
Acceleration: (+)2.0, (-)1.0
Lateral: (+/-)0.5
For inversions, I like to play it safe and have about, if not above, (+)1 vertical G's to ensure the coaster can make it through and to have the rider remain in the seat no mater what (This excludes Heartline Rolls).
For every turn, I like to add a few tenths of lateral G's to ensure the rider feels the entire turn. This also adds a weird & different element.