I find staying away from all meat except for tuna lets me drop a amount significant weight within about 2 days if I have been eating it before. That's one no stress way to drop a little weight.

I'm 600 g lighter in the morning than at night as long as I'm not dehydrated when I go to bed otherwise my body holds onto a bit more. Bigger people would loose more weight. Do you weigh yourself morning and night? I assume you do and you know all this but just in case. Are you 1 kg over in the morning or only at night?

Complex carbohydrates also hold water so if you stay away from pasta, rice, bread, bananas, potatoes etc the day before the weigh in you'll loose weight easily. You can still get energy from simple carbohydrates in most fruit etc and high GI foods.

In the morning straight after the weigh in you can maybe eat something with some complex carbs would be good though if you have at least 5 hours before competing.

I took my own scales to the national titles so i could watch my weight like a hawk. It's a good idea to compare them directly to the test scales just in case they're out a bit though. My scales were accurate but the team manager brought a cheap set along that weighed everyone 1 kg over and had most of the guys stressing out when they didn't have to!

As for training - yeah I think taper - you go at 110 % all the time judging by your training posts so tapering would be especially beneficial for you!