Adding weeight at the front end of an X6sq when running Lipo is critical to be honest. As a very rough generalisation you want at least 100g spread between the speedo tray and the front of the car. This is assuming you're running on dry conditions, the exception is wet astro when taking the weight out of the front (and potentially adding some to the back) really helps make the car very safe allowing you to push. Some see this as a disadvantage that you 'have' to move the weight but as soon as you've tried it you realise it's an advantage as you have the best of both worlds!!!