RE: 240 GR. vs 300 GR, XTP
Very interesting results with the 240 grain XTP. Others claim such excellent stopping power and even blood trails. I guess it all boils down to where the deer was hit. But you do seem to have lots of field experience with the projectile.
I've never shot deer with XTP's yet. I would think you would have more energy with the 300 grains and possibly better penetration otherwise I think I might look at a shockwaves type bullet and see if that does not work better.
It's obvious that your a skilled tracker to be able to find deer leaving no blood trail, into thickets. I hunt thickets and know what you're dealing with... Good job on the deer.