Not sure if these will help, but i did manage to secure a set of Redmi back in March in the first try and then the redmi note last week first try too. Also was able to get the Gold iPhone 5S at launch.
1. Setup Chrome Autofill. After putting the item in cart, you need to checkout. Having autofill makes the process a lot faster. (if you need practice, go add any accessories to cart now and check out to see how the process goes)
2. Make sure the clock on your computer is accurate. Close all other pages/tabs that might be loading data. Close apps that uses the network too. The only page you need open is the page to buy your Xiaomi device. (might seem excessive, but better safe than sorry)
3. Login before hand, and instead of reloading the entire page, click the "Redmi Note" or "Redmi 1S" tab at the top of the page. It only reloads the section concerning the device and not the entire page. Takes much lesser time compared to reloading the whole page but still refreshes the status. Start clicking at 1159 or close to 1200.