I have
P225/70r15
There's your problem.
Caster is good. so aligning the upper arm further forward to keep a large tire off the plastic can result in worse handling and wandering on the highway.
To run 16X8's with 255/50's (26.1" diameter) I had to take a sledge hammer/heat gun to the liners and they still just rub slightly when the tires are new.