Slice? Prolly not Mr. Mac

Gotta remember possums are kinda fat & rolly-polly, so their aerodynamics are far different than a more oblongated kitten. If the kitten stays in a rolled up position, it's aeordynamics are dependant on wind conditions and spin off the club.
Possums also have more wind resistance, so using the wedge in a short chip situation IS the way to go. The biggest, fattest wood you have will also take a gopher off the tee nicely.
It is the stormy season for you in Oklahoma, are you sure those hooks and slices aren't due to some unseen crosswinds?
ROX