Sure thing! understand exactly where you're coming from, the OE fitment is a joke haha. I like the idea of waiting til after the springs settle in to decide on wheels, you'll want to see what kind of gap you're working with before you finalize. It seems that 18s are just the more common size for...
When I see those "hellaflush" DE4s, offsets are around the +30-35 range, so that would be the number I guess, but how you achieve that is up to you. The purpose of a spacer is to visually alter the offset of an existing wheel, so what spacer you'd need is dependent on the offset of the wheel. If...