I don't know exectly what happened to the Bigby 7-9 spells, but I agree with Ar7.
The spells are now close to useless, since the Effect per Slot is very low
compared to other spells. And not only compared to spells at the same high
circles, but even compared to ones at 5-6.
Even before the changes, the usefulness was limited since it was single target and
the high circles gives low number of slots. But they were still good spells, wich
is only to be expected from circle 7-9 spells.