Well, I think tha KBTL values are as they should be
In KBAP original, these values were vastly overrated - 1 archer uses fire arrow, hits for 1 point, and inflicts 100 points of fire damage through burning afterwards. Where is the logic in this? Is his fire arrow enchanted by the gods???
In my eyes, that was improper. Dragons could kill entire stacks of lower level units with a single breath. 20 black dragons attack 560 Priests and 280 Inquisitors behind them. About 90 Priests and 30 Inquisitors die. Burning damage follows - 400 more Priests and 150 more inquisitors die. Nice!!! Carnage for the win!!!
EDIT: Well, even now you can see enemies that hit for 1 and do 20+ fire damage, but it's not as wicked as it was.
Besides, if you want better burning/posion damage, work on your Battle Alchemy medal
If this problem exists in the demo, let's hope it doesn't exist in the english version of the game. However, I'm positive that it doesn't, since it was already fixed in the russian version, and I'm positive that the developers made the english version using the latest Russian version.