Just reduce lance damage. Seriously 1/4 reduction in damage on couches and thrusts, no fancy bullshit. That will make it easier for infantry.
A more encompassing nerf would be to remove the ease of hybridization between melee and cav builds, so people would have to sacrifice more to ride their +3 courser with heavy lance around in heavy armor before being dismounted and spamming their polearm for easy kills.
Lastly, the old lancing angle was retarded, and made you more invincible to non 200+ reach attacks than cav already are. Saying that removed skill from cav is like saying that removing 360 jump spin stabs with 300 reach weapons removed skill from the game. Of course some will agree with that no matter what, but to me it just looks like making the game a little more methodical and less about animation abuse like some ADD sugar high twitch gaming "bullet hell" japanese game.
Also if you are a better cav player you will still beat people in cavalry engagements no problem, not by SPIN STOP 180 STRAFE SWIVEL SHIFT TRICK LANCE THRUST while breaking your spine in the process, but by cutting them off, juking their timing, things that don't involve waggling your mouse to extreme angles.
Lastly, don't kid ourselves. Cav go for easy unaware infantry under any conditions, just because its easiest. And most importantly, I think it is insane to propose that buffing lancers is an effective way to make infantry stronger to them. Its doing the opposite.