When is the audition?
600 - 700 grams should be just about enough to replete. You could probably cut that back at this point unless you think you need to fill out a little more. Usually 500 grams over 24 hrs repletes a 70 kg pencil neck marathoner that is completely depleted, since you're around 93 kg, you're probably gettting close. Once you're hard and full, cut the carbs back and decrease sodium but only if you're less than 36 hours out, keep the water in. I wouldn't mess with the lasix, don't think you'll need it and it is more likely to make you flat and cramp rather than help.
The term spill over confuses me. Spill over to where? Carbs are stored in the liver and muscle to the largest extent. They can't sit under the skin and pull in water, however continued high conc of blood insulin will increase water retention.
If you're filled out enough by now, then cut back and you should be fine.
MS, It is muscle glycogen that the endurance athletes are interested in filling and they don't deplete either, just increase carbs to 70 - 75% of their diet vs 60 - 65%. Complete depletion isn't necessary to supercompensate. That was the old school thinking prior to the mid-80's.
W6