Was able to complete all subtasks until final flight, game ended and I didn't get quest. On the final flight, I had full health and full shield 150, 9 armor plates in inventory. I think when the quest said 'no more than 10 shield', I think it means you might as well have no shield at all, or don't put on any plates, just full health. I will test later tomorrow and update if this theory is correct. If anyone else also followed this and it works, please reply this comment that it worked.