I'm not sure I understand your goal here. Are you saying you don't want the boat to be easy to heel? In my opinion, heeling is what you want the boat to do to protect the rig from failure in violent gusts, among other things. This is coming from somebody who really dislikes heeling, but who put our mast in the water more than once in my novice sailing days.
Our Jeanneau Sun Fizz's displacement was 7.3 t, keel weight 3 t. She was one of the first "racer cruisers" and certainly wasn't for everyone as a cruising boat. She was a quick and lively boat that sailed very well. We were not racers, but cruising we consistently outperformed other cruising boats of the same size. For example, from Ecuador to Easter Island, we arrived after 19 days, our friends in a heavier, but same size, boat took 23 days to make the same trip.
Because we seemed to want to go places that weren't downwind, we sometimes beat ourselves and our boat up a bit more than the average cruising sailor. I don't think that we could have done some of those trips had we had the conventional heavy-displacement full-keel boat. When we weren't going to weather in 35+ knot winds I think she was as comfortable as a heavier boat which, I understand, is the average cruiser's reason for getting one of those "oyster crushers". I would comment, though, that had we wanted to do high latitude sailing I believe that we would have had a heavier boat.
Just one opinion among many, though.