Lance attacks too strong?

[Companion Cavalry]

care to use F=MA and calculate the raw power in a catank charge?

no really, I am interested to know =]

That would be immense, the force in question would probably be in the measure of tonnes.

For a precise figure, you would need to know the cataphract's speed, the weight of the horse and rider in question, the weight of the kontos, and finally the duration of the charge before impact.