1st - They keep quoting the payload as being 60,000 kg; isn't that for the passenger version. The cargo version has a max payload of 248,000 lb (112,490 kg) or almost twice.
2nd - I did a quick calculation and the acceleration should have been at least 51 % higher to reach that speed which is quite a lot !!
that means that the thrust EPR settings should have been 51% higher (at least) or that the weight should have been 66% of what it was (or less) or have needed 13295 ft (at least) with that acceleration (thrust and weight). Much more than the 8800 ft available
Big numbers !!! I can only guess wrong EPR settings and, then, some weight issues.