Ok, a few TRs under my belt now with the new curves.
Maybe it is me, but Levels 15 and 16 (where I'm banking even) seem to blitz by now. Level 17 or so was always a bit rougher, but with the sagas and the new curve, GH and Necro 4 just fly by.
Lower levels are somewhat sloggy. 4/5 are easy, but more repetition than I personally like.
I don't know if others are feeling the same (again this is a gut-feel), or if there is an opportunity to maybe jigger the curve a tad.