Wiggs, this is approximately how many pros do the last week:
Start with a diuretic like aldactone several days out, maybe a week. On wednesday, after depleting, you start carb loading hard with insulin, monitoring the look all the time. Then on friday night the guru looks at the guy and decides how much more water he needs to lose come predjudging. Then you take a loop diuretic like Bumex, Lasix etc, which works real quick, according to how the look is coming along. Too flat in the morning, take in more carbs, perhaps drinking more water. Watery, don't drink water, take more diuretic. That sort of thing.
Then again there are some who do the half a dyazide friday night thing, or even no diuretic at all, though almost all use at least a little diuretics.
The last second adjustments don't do shit if you're not lean enough and a lot of guys come in looking off and then blame the last minute stuff.