Tenne- your inquiry therefor is that the slow animation should result in less damage, which is understandable.
However, the slow animation on the Heavy lance is meant to nerf it, as in "slower weapons are weaker", not in terms of damage.
This, however, actually only nerfs the use whilst dehorsed.
I personally loved the patch a few months back when the lance was even slower, as the speed multi gets elevated with the lower speed of the used weapon, so the following proposition is actually a lancer nerf:
I would suggest making the lances faster. This would decrease their speed damage bonus, would make timing a perfect hit harder, and wouldnt give you a headache about why you just got killed by a standing lancer : )