On Melee Hit Daze Items

[Millefiori]

In the current version I find a ton of these items. My belt alone has 40% chance to daze on melee hit (I upgraded from 30% on my previous belt).

My questions are these:

1) Does the chance stack? Or is just the highest one applied?

2) When is the status effect applied? Can I remove the effect in the same round by dualwielding/prodigyfisting?

3) Am I just really lucky by finding these items or does anyone else do? They seem pretty overpowered. :/