I don't think the Shroud is generally any harder than it was before.
Harry does seem to be a bit more tweaked than he should be post U14 on all difficulties, and I think that is due to some lingering spell power bug.
However, since U14, I have completed many Hard Shrouds, as well as wiped in a few and then come back to claim victory.
Kind of on the fence on what exactly is going on, but I think a good place to begin looking is to see how the new spell power is affecting Harry. Blades and all that are the same.