Are you talking about the 'editor.BreakElement' property?

if so, Yes I has bad experiences with them also (I do believe it should be p and not <p>)  EG:

 

editor.BreakElement= "div"

or

editor.BreakElement= "p"

 

(Unless they have changed the 'editor.BreakElement' property like many others from version 4.0 to 5.0)

 

I use div for best results

 

HTH