It seems that the A350-900ULR has incorrect range. In-game the A350-900 has more range and that makes no sense.
Currently in-game the A350 range goes as follows:
A350-900: 9,537mi (11,220mi max)
A350-900ULR: 9,520mi (11,200mi max)
A350-1000: 9,390mi (11,047mi max)
I think the A350-900ULR should be around 10,000mi somewhat similar to the 777-200LR.