@Genesis-Mining: do you have a functional GPU miner for zcash? The zcash mining contracts purchase page still mentions that the contract execution is conditional to you getting a GPU miner within two weeks of launch. We are now one week away from launch, and your competitors all reportedly have a GPU miner.
You have upgraded the hashrate 3x and then 2x following further optimization. This is not consistent with the disclaimer that warns that, should you not meet the promised hashrate, you reserve the right to delay or cancel the effective contract start date. Obviously if each time your mining software meets your hashrate commitment, you increase that commitment, you will always be in a situation of not being able to deliver on that commitment, which means that the contracts you are selling are not launch-day contracts but mid-november contracts. That's not what your customers want. Your customers want to mine on launch day whether it rains or snows. Further hashrate improvements are welcome, but shouldn't get in the way of timely contract start.