Hi! I've not been able to delve into this issue deeply, but it could be useful to know that "fragsizeIsMinimum" and "fragAlignRatio" are new parameters which have behavior changing default values.
Leaving those with their default values makes the comparison between 8.4 and 8.5 like apples to oranges in a sense. To have the new UH behave like the old one as closely as possible use: fragsizeIsMinimum=false fragAlignRatio=0
