I just got my X Plaid with 20 inch wheels in. Staring from the back, the camber is pretty noticeable even on low. Macsboost sells a shim kit - planning on installing it myself this week. It’s just 2 plates - one on each side and seems expensive for what it is ($~262) albeit marine stainless steel but if it saves my tires and wallet from uneven wear I’ll give it a try. Instructions seem straightforward- remove arm bolts, put shim behind, reinstall bolts, then adjust for toe with a 3/4 turn of another bolt. I already have my jack and torque gauges since I usually swap out for winter tires each year on our Y and previous 3.