AO jobs are coming. They're considerably harder than this, and this was something I began even before I officially became a dev.
They're considerably less "I cast bigby 9 on the str based fighter, I win" and considerably more "I have a tool for every situation". Yes, your Conj bigby mages got nerfed. Conj is still a great school, and a large number of bigby mages I've seen have had at least some Evo focuses for the AB on old 9.
Regarding individual concerns:
wow i gotta say that lvl 7 bigby is now the DUMBEST and most useless spell in the game, you gotta be a special kind of moron to want to drag your opponents closer to your mage.....
Well, if its a 1v1, maybe, or maybe they have a relic?
Additionaly testing showed that all shifter shapes (in use by players) have enough STR to overcome Bigby 7.
It should be an even contest for most of the preepic ones, and in the shifters favour for the epic ones. If its not, then maybe I need to add more to the mages check

.
In general: Be aware that no bigbies stack, as before. AC loss from bigby 9 will not help bigby 6 hit. Bigby 6 already has obscenely high AB, which is probably why I made sure it worked like that.
Try extending your bigby 6 for a little more knockback effect.
Bigby 8 gets to 33% failure on bigby 8? Thats a hell of a lot for your 1:6 action efficiency.
I'm hesitant to make it extendable
yet, but I'm definitely open to good feedback.
Understand: If you scream and yell and carry on, and I don't get any feedback at all, then the best we can do is to say "Well, lots of people don't like bigby spells, but no reasons. Must just be that its changed from the same old same old."
Also, lets not get sidetracked here. Am I goin crazy? New dev to add AO jobs and fix bugs and the first thing he does is NERF THE CLASS HIS FACTION DIDN'T HAVE. Come on!
I think the first thing I did were actually exploit fixes and the damage shields fix.
I think that when you all actually try the bigbys, and play your mages, you'll have a heap more fun with them, because instead of just throwing down the same things over and over you'll actually have a variety of valid options, and a pair (6 and 7) of very much fun bigbies.
Just as an example: In an optimal 40 mage with 22 cast stat and ESF Evo:
Bigs 5 : Never misses, target receives -10 AB, for 10/20 rounds.
Bigs 6 : 66 AB to hit, on hit target receives average 180 bludg damage, on hit target is pushed far away, on 10 or higher d20 roll target is KD 3 seconds
Bigs 7 : Never misses, Caststat+d20+40 VS 40+d20+strmod , if mage wins, the target is pulled towards caster and then slowed for 3 rounds.
Bigs 8 : Never misses, target receives 1/3 spell failure rate.
Bigs 9 : Never misses, target receives -5 AC.