Sorry for the slow reply , I've been away on hols. Yes 1.9" refers to the inner diameter and 9" is the length.
I did a 100 mile trip on very rough roads with just me in the car a few days ago and was wishing I had the 250lb springs back on the rear but I know that once I put a passenger in I would want the 300 lb springs back in. You can get rates between those so the choice is yours. I am just over 14 stone and my passengers are maybe a stone lighter so that may influence your choice.
The information regarding my springs and shocks was a copy and paste from my Rally Design invoice so it was the way they wrote it down, sorry if it confused.