GPMD.... I think you are overthinking it. You said you are 100% on recovery, and like the lungs. Keep doing what you are doing, and any quality bullet you do it with will be fine.
So many good bullets out there, and many mentioned here. Barnes, Lehigh, Speer DeepCurl, XTP... take your pic. They all work great.
I personally like the Deep Curl, awesome performing bullet. If I was really worried about bad shots...the Lehigh may be one I would consider as they do have the petals that peel off and one might just clip the vitals on an errant shot.