Nose down a bit is much better than nose up. I would leave it exactly as it is with the 6 links. I don't think you are going to get much better than that. Enjoy your rig! You have done more homework than most and I think you will have a nice towing experience.
I would still get to a scale on your first trip out and get everything weighed. We usually do ours each year on our way down to Florida for the winter when we are loaded to the gills! After a few times, the weigh slips kept looking the same so now we don't bother. We don't pick up any rocks to save either (ala Lucile Ball). :W
Barney