Took a all mounted list with birdy.
Took core gw knights with priest of Ulric 13 strong+ priest 7 wide. Faced against tooled up black orcs. (Other targets we ng w/fanatics) We basically ate each other. Was surprised how well they did. Got reroll 6's prayers off. It was likely equal points.
I've been considering filling my core with a big unit of knights with drilled. It only increases the cost of a knight by 4% to give him drilled. (Increases the cost of a state troop by, what, 20 %?)
Before you charge, use drilled the redress the ranks and then charge in 12 wide or whatever. If its your first charge, you should be able to make even a formed enemy block with lots of static CR from ranks FBIGO.
Also, with 12 knights in the unit, you have a unit strength of 24. I think if you could finesse the numbers so that your knight unit would outnumber the target infantry block (often maybe 20 or 24 in size) by two to one after combat, you could guarantee a flee instead of a FBIGO.
I would expect such a knight unit to attract a lot of magical attention, so perhaps a witch hunter in there for the MR would be useful.