Citation 2 and Max Angle
All the calculation you did happens even in flaps full. You may not be able to uplift 5kgs less but even 3 kgs is saved out of the 5kgs multiplied by 100s of sectors over one year amounts to something. About the pitch attitude is to remember that it is already in landing attitude all you need is controlled thrust reduction without much flare. Airlines wanting this should gradually introduce it in SIM checks.