Well, I can only give you an idea of what I did before my show last september.. Maybe it'll be usefull for yuh!
The week before showtime:
1. Carbs are low, maybe at 80g the first two days,(Sunday and Monday).. This is a slow drop over a set amount of weeks, so getting it right the first time is key.. I used Lean Mass Matrix by Prolab since it has 40g. carbs from oat flour and milled brown rice,(slow digesting carbs, or low-glycemic)
2. I posed for 2 hours a day, before breakfast.. The constant tension you go thru doing this will work up a good sweat, and it also helps the muscle stand out abit more because you can control them to pop out at anytime... THAT muscle is your choice to flex or not..
3. The final 3 days are solely for water-loss, and carbs should be less than 60g.. Tapering off your carbs this way, while increasing water intake, will dry out your physique quickly, and without sacrificing volume.. Use a simple water pill like Taraxatone... Just stack it with extra Dandelion root, it's a cheap herb, maybe $5 at Vitamin World.. Dandelion has natural-occurring potassium, which will help draw the water into the muscle more, and shed the subcutaneous stuff from your abs..
4. Get a tube of Preparation H Coolong Gel.. Make sure it's the Cooling Gel or you'll smell like dead fish.. There's cod oil in regular Prep-H.. The main ingredient in the "gel" is a vasoconstricter, it will tighten the skin, and force liquid outward.. You will sweat abit where you apply it, so carefull having this stuff in your hand..
Ok, abit long-winded.. Let me know if it's abit much for you..