over time you're going to have a problem with skimmer performance since you're blocking the air on top of the lid. Not to mention you will have salt creep in those lines if you dont keep them clean (another manual operation we try to avoid) ;-)
I think you've got a pretty good idea for the skimmer wash-down, but as your equipment and hoses are all new you haven't seen any wear and tear on them yet. I would seriously suggest you get hose clamps on all those Genesis and hose connections. Make sure the hose clamps are marked "SS" for "Stainless Steel" so they won't quickly rust out on you.
Dave.M