I run 168 TAPs (amax) and leave the zero alone. This, of course, is not a great long range process nor is it nearly as precise as I would want for a trophy. That said, I do the same thing for hogs: 175 SMKs for precision and for zero, then 168 TAPs for the piggies.
I've hunted SMKs and never use them on game I need to recover. For pigs, I want maximum effect on target, but without the cost of Barnes TSX or TTSX, both of which I have had outstanding success using on game.
For a pig, a softpoint or amax and a confirmed similarity in flight path out to max distance. For a trophy: never a SMK and always a Barnes purpose-built bullet. You can get by with less; but if game that walks away is really bad, shot placement is most important, and bullet construction is next.