Another rear tire wear question - worn out in the middle

[titan silber]

I’ve owned my 4.8is for about 3.5 years. When I bought it at 55K miles it was fitted with Dunlop runflat tires which gave a harsh ride. They also wore down to the cords on their inner edges after about 10K miles.

At this point I did a major suspension refresh replacing the rear trailing arm bushes, the track control arms and the camber arms. The air suspension was set to about 1 inch lower than factory spec and I had a four wheel alignment done. The rear cambers ended up at -2.8 degrees due to limits in the adjustment. The toe ended up at 0.18 and 0.2 degrees - I don’t recall if this was limited by the adjustments or not.

At 60K miles the runlets were ditched and replaced by Falken FK510s. Fast forward 10K miles and I was startled to find the middle of both rear tires worn down to the wear bars while the inner and outer edges were still at 4mm.

I run the rears at roughly 34 psi. Is my high center wear due to the inflation pressure or the alignment? I would have predicted that a toe issue would have worn one edge more than the other, not the middle. Or ore the Fallen FK510s just made from recycled marshmallows? And feedback or advice is appreciated.