To be consistent in the long run you need to focus on one goal at a time. So don't do some hotlapping with a few liters fuel and after 10 minutes start on doing a long stint. Stick to one plan at a time. Actually before you start doing hotlaps make sure you can do at least 10 to 15 rounds in one row to get to learn your car and the pace you can do without making mistakes. Your laptimes should be within a few tenths of a second. After you reached your goal in consistency on the long run continue to the hotlapping. Most people also got different setups for the race as for the qualify practice.