I took delivery of a brand new Ventus 2c, had the W&B done for my weight plus chute. Took the glider for it's first flight and thank goodness it was a great soaring day as it took me about two hours to be able to control it between 45-75 knots. Turns out they figured out the correct weight, say 5 pounds, wrote it in log book, but when they actually the weight in they used Kilograms, so I had 5 kg instead of 5 lb in tail. We figured it out, but I forgot the number, I was WELL aft of the aft most CG. I agree, check W&B.