It's the fact that it's a new engine. Engines with a tight pinch like the picco's all do the same thing, they are very hard to get a good tune and need to be fully broken in before you try as it just won't happen. Richen the LSN so it idles down and then just drive it around and burn that gallon. Trying to get a good tune at this point will be fruitless, it's just the way it is.