[wbradley]

The rear suspension isn't a Mcpherson strut, it's Subaru's pseudo double-wishbone. The suspension itself is the load bearing structure, not the shock. If the shock was bent from a hit then there would likely be a lot more bent. Your vehicle could have taken an impact underneath that bent a control arm or the rear subframe. The running board is a different point of impact, obviously.

The car should be inspected underneath and the visual measurement you are doing for camber can actually be be done more accurately with a leveler app on an smart phone. The phone needs to be held along the rim or place a uniform flat object against the wheel, then the phone. Use level ground.

A 1" lowering doesn't "scream" for rear LCA's but the negative camber will increase as you go lower. The OEM settings do have some negative camber in rear so it will be accentuated as you drop. I am on a 20 mm drop (.78") with coilovers with front camber plates. The plates increase noise/harshness as they have a pillow ball bearing.

Pretty sure you should be OK stock with TRD 1" lowering springs/Eibach Sportlines. If in 50,000 km you see notable shoulder wear on the rear tires then invest in adjustable rear LCA's going forward. I think Tcoat has TRD springs since new on stock suspension/tires without issue. The current wisdom seems to be for street use or occasoinal track, max drop 1" no absolute need for camber correction. Camber bolts in the front are cheap so maybe worth adding a bit since the rear was increased.

YMMV