Design temperatures and pressures are typically not used in a flexibility analysis. Therefore Case 1 (and all cases built on it) are not needed here.

From your description, Case 2 should use P2, not P1.

Cases 4 – 6 should use your T2/P2, the operating conditions.

Case 7 should be L2 – L3 (operating minus sustained).

Cases 8 – 10 should be L4-L2, L5-L2, and L6-L2.

Cases 11 and 12 are ok (I presume U2 is vertical).

Cases 13-20 are ok.

Cases 21 and 22 are incorrect. These cases should be L13+L14+L15+L16. Do not include 17 – 20 here because these later cases are a stress summation.