That is way we need to do more block brackets and forget about weigh classes until sub district. Weigh everyone in, split them into their age groups, start from the lightest and put them in groups of 5 for roundrobins. Every kid gets 4 matches every weekend, you have less chance of seeing the same kids because weight will fluxuate, and if you want to be fancy you could use ABCD ranking along with the weight to make the brackets. You may also need to make a rule that you would not exceed certin weight differences between kids depending on ages. What other ideas do people have?