Could you try putting the love seats on either side of the fireplace slightly angled.in. Put a round table and chairs in front of fireplace and put a smaller seating area over where the Adirondack chair is.

Or move the seating group to where Adirondack chair is. Love seats perpendicular to railing. Dining table in front of fireplace and two new chairs next to fireplace on each side angled in.

You'd have to be very careful about sizes, but this will fit, but you may not want the bench so close to the window. Your other option is two, 4 top round tables in place of the one table,

I'm a fan of a dining set. You could get something like...

http://houzz.com/photos/28612936

Get something with chairs similar to those you have. That way, you can change the arrangement to match what you need. If you are having people for afternoon drinks, you'll have plenty of seating and space. Put the dining table out when you plan on having a dinner party. This may work only if you have storage of course.

If the OP wants seating for 8 at the table, chairs like you are suggesting are too large to use.