I 2nd the suggestions. It is difficult to have a perennial bed do so well, and then have to make the decisions of keeping, dividing, sacrificing etc. I would let it ride out the summer, and as mentioned mark your bleeding heart spot. This will give you time to re-arrange in your mind. Then come September do the digging, dividing etc.
One thinks of perennial beds as being set, but they are not! Always shifting! And some things don't make it, another plant put in that space. Some plants just want to have it all for themselves.
Sounds like a pretty space you have with your selections.