About knockdown:
Max knockdown chance is 30% IIRC, and depends on raw damage and weapon weight for the most part.
The reason you feel 1h maces knockdown so much is because you get hit much more by them.
If you need 2 hits to kill someone, then it's fairly low chance that the one hit (remember: they die on the second hit) will knock you down, but if you need 3 or more hits, then you suddenly got double the amount of hits landing, making knockdown appear to happen more often with 1h.
About turn speed adjusting:
You say that 1h got a huge bonus from this. No. Short and light weapons did. Yes, 1h got a better range of turning from this AND they are the ones with the shortest and lightest weapons. But if you are complaining about short and light weapons getting a buff, then please think about what you are saying. Before, more reach was always better. Same with weapon weight, for the most part. Now they made choosing a lighter and shorter weapon more viable and gave them one real advantage, when they really only had drawbacks before. Why complain about that?