I look forward to what the dog has to say. Terrain can make a big difference in recovering game, a good dog very useful.When all is said and done, I hope you go back out with a dog & find your deer. Then you'll have closure. If you don't find it, you'll never know if you hit or not. But one thing is certain - you probably can't trust your current bullet choice FOR HUNTING so, a change is in order.
Keep us posted.
Lots of lung tissue doesn't bleed much, and it doesn't take but a small bit of lung function for a deer to cover a lot of ground.
As far as the bullet being trustworthy in the future, it doesn't sound like you will.
Sounds like pieces of the puzzle stacked against you, more than just a bullet, or placement.