Looks to me like your wearing out the center and its normal wear

 

yuuup ... you need to go around more corners.

 

agreed.. i don't think its a wearing issue, it think its a non-wearing issue. hes not going around enough turns and or hard enough. I do a lot of super slab riding, with simliar center wear. when i do get on our back roads around here, i try to run her hard through the turns.. plus i found out you get over the scraping sound...