I have had only one .530 ball not go through and through, and that was after an "odd" sounding noise when I fired, so I think it was a partially damp powder charge..., and the range was about 50 yards with 70 grains of 3Fg.
Otherwise out to 110 yards, my all lead, Hornady brand, round ball goes through the deer with a broadside shot.
I'd say the easiest thing to try would be go to wheel weights, as it will lighten the ball by 10 grains, but will not deform nearly as much as all lead. A .530 hole is a .530 hole after all...,
Now as to blood trails, well I have seen the deer fall, or found them a after short distance, but I have also seen them go 80 yards with no blood, and then suddenly leave a very obvious trail for the next twenty yards, leading up to them. You can never tell. I prefer a double lung hit, with two external holes, as that does a better job of collapsing the lungs, and two holes may bleed better, but it's the lungs I am after.
LD