Melting /bending advice

thanks for your patience, very new to this. 2016 SR5 4x. I put on 275 60 r20 on. vision Turbine wheels. I was told by Discount tire they’d fit, but they rub. I removed the front Shiels guards. The actual point of contact is in the front only at full turn.and worse backing up. Tires rub the exact spot where the vertical wheel well meets the lateral. The 90° bend between wheel well and under bumper. I have tried to heat and bend but the 90° elbow turn is the thickest part of the plastic and is melting before it will give way to bending . After 2k on tires rims I’m trying to avoid the $600-900 leveling. I ve heard about shims, like most of your advice here melting seems easiest, most affordable. Any help would be appreciated. Side note, since it only rubs at full turn do many guys just leave it alone and be careful at full turn?