Might have found a decent proficiency-farming method.

[prosthetic soul]

1. Wei route, Chapter 4 (probably an equivalent in Shu and Wu)

2. Suppression of Yan Province (Mission, not Story, can be found in Records)

3. I am using Red Hare, but I doubt it's required as long as you're properly leveled enough and/or aren't playing on Ultimate Warrior or something. Haven't tested it out though. Basically, just use a horse and constantly ram through the Large Force back and forth, nonstop. Keep chugging that portable item that gives you a proficiency boost as well.

4. Rinse, repeat until Large Force is gone, finish up by killing Bandit Leader. Start over.

I've gone from "~95000 left until level up" for a Padao at level 10 to a "5908 left to level up" in two completions of the mission. Dunno if there's a better method out there. Probably is. One I'm using right now though.

[Cheezelog]

Were you using the training weapons for this method where you get 200% proficiency?

[prosthetic soul]

Originally posted by Cheezelog:

Were you using the training weapons for this method where you get 200% proficiency?

Yes.

[Klinestife]

i'm personally using suppression of yuan shu. run into the castle as soon as the ladders are put down and go right to him. the army will infinitely spawn until yuan shu dies, so it's easy to go up to 5k kills for max skill points, kill him, then repeat.