Shimmer have you considered that hex scroll that you turn them into a toad on say a cheap NG shaman.
I know it's expensive and won't work all the time but it works sometimes and can gimp someones magic quite a bit till you can get in there and start killing stuff.
Another option is adding a cheapish wolf big boss with the all your wardsave are belong to us item as an assassin.
Risky but it could work. You really need there speed to get after those mages early.
Multiple small savage boar units can work too. Da big spida is another option too.
You could also use feedback to weaken them send in the wolfs to finish him hopefully. If that fails you can try to get a snipe spell off. If you can get woulds off early they may not risk the miscast.
It doesn't seem your games where that bad considering the ogre game was close plus they don't have super spells, the orc game was pure fun, the chaos list was not legal and dark elves well there a bunch of pansies without thier magic.
Anyway i think you need some options in your list that are an early threat so the boyz can get ignored a little then come in and bash stuff. Maybe im wrong though just trying to throw some ideas out there.