Tires for pulling? Radial vs. Bias

How would BF Goodrich Power grips Bias ply do for pulling in farm stock classes vs. radials. 20.8-38 in #12000 & #14000 classes. Side walls are good and stiff, no cracks look brand new other than tread of course, have about 35% tread left. Most everyone else has radials, I had these laying inside shed, so gonna use them this summer. I was told to run psi different than it being a radial. basically 1lb per how heavy class (ex. #12000=12lbs. psi. Everyone else runs radials I 'm gonna be different, just wanted some opinions thanks