As I've already said elsewhere - I think pretty much all of these changes are good, but I am worried about the dismounting thing.
Without having tested it myself, I would say the resistance for light cav needs to be at least 70, and heavy cav should be increased a little as well.
More importantly than that is that, IMO, this ability should not be given to cavalry classes. Like the first time around, this will lead to many situations where you get a good hit in on an opponent, he gets dismounted, and then you get to kill him for free. This is no fun.
If you are set on introducing this mechanic, I think infantry should have the ability to do it (I like having it on twohanders - maybe also consider giving it to Pikes to improve them as well. Spears could get it too, but not in combination with the cavalry breaker perk IMO.) but not cavalry/mounted people*. It's not only no fun for cav vs cav fights, it would also result in any other perk in the same slot as the dismounting one never be picked.
Downloading the beta at the moment, hoping to give things a test this evening or so.
* I guess some people may argue realism here, but lets face it: This is not a sim-game, and gameplay/balance >> realism.