Uneven tire wear (pics) - what's the cause?

OK guys, had this happen twice now (2 sets of tires). Rotated every 5K miles, alignment is good. All 4 tires will wear more on the inside with every other knob being even lower (see pics).

From what I've read on the internet it said worn suspension. I must admit that after adding the ARB bumper the entire front suspension has compressed a few inches over time.

Is it as simple as a heavier coil swap & new shocks? Anything else I should be checking?

 

Its most likely due to the added weight compressing the suspension

 

Excessive toe out

 

Could that be caused by the heavy bumper & suspension sag?

 

Ta-Daaahh ...... Captain Obvious to the rescue, "YES!"

 

That's easy enough to fix.....plan on upgrading the UCA's while I'm at it.