Doug, one thing as you said is that you do a carb up almost daily now. If you feel that you look best keeping things as they are then bottom line amazing conditioning and having a good amount of glycogen in your system is the way to go. However the traditional Skip loading may do well for you being that you go massive on carbs until fully spilled over then go moderate carbs for a few days while flushing add to that the diuretic and you could come in looking sick. Last time you tried it you were nowhere near the body fat you needed to be to see what it was truly capable of and the fear of remaining spilled over was big in your mind because conditioning was not there. Also try refraining from dairy during your carb up it will make you hold water even before your glycogen levels are all the way up so that yogurt should not be any where around the show or during the test runs. At least the week of in my opinion.
I would try 2 scenarios, 1 a full on 1400-1600 gram carb load early in the week like say Tuesday and Wednesday get nice and spilled over. Then moderate-lower carbs Thursday and Friday with a lot more water intake, and then a good 50-100 grams worth of carbs about 2-3 hours before the hours before prejudging or when prejudging should be. Nothing with fiber in it but maybe keep some of those Goo energy packs for runners, and a snickers on hand to quickly adjust your glycogen levels without any bloat on the way into prejudging about 30-45 minutes ahead of it like say 20 minutes before you start working for your pump. So first find out when prejudging will be so you can get your timing down for the pre run.
Second scenario would be as you said do what you normally do and then maintain it by not fasting in the morning but adding in more carbs to keep the glycogen levels at that sem place and just get your pump on. You could use same things like the goo packs or a snickers bar.
Don't worry about the BS of not running too many test runs and your body not sucking up the glycogen due to insulin resistance. Your current diet already negates that by keeping insulin sensitivity high. Others who rely solely on carbs for energy, take in higher levels of carbs at all times making them have lower insulin sensitivity than you will with the fasting. So the tests won't hurt you. You have time for at least 2-3 more good test runs, maybe 3 so get them in. Decide on one or the other after testing both scenarios then repeat the one you decided on one last time making any tweaks you thought you should from the other test and you will have a good idea of what you need to do to truly peak.
Also take pics every hour or two during the tests even if that means putting the camera on a 5-10 second delay on a tripod, counter, or table and just taking them yourself. That way you will have an idea of when you looked your best and when condition started deteriorating. Doesn't have to be awesome quality just something to go off of. I do all of my progress shots on a web cam with a 5 second timer. Not professional looking at all but they catch what I and others in my log need to see.
