rear tire wear

kfull

just checked my tread depths on the rear tires at ~ 26k miles:

(from inside to outside)
Left rear: 5/32, 6/32, 5/32, 2/32
Right rear: 5/32, 4/32, 5/32, 2/32

Outside wear is much more. I did have an alignment back in the early spring so I don't think I have alignment issues. I think it might just be my driving style (I like corners and turns) Does this look pretty typical? I didn't check my fronts because it was getting dark outside and I didn't feel like getting on my knees again (no jokes or you get a ) Couple more months I'll be putting on my winter tires anyways then in the spring I was planning to get a set of PSS's for my summer changeover. I know the front tires have much less wear but from what I've read it's better not to have 2 different brands/types of tires on the front and rear- Anyone do this without problems or is it better just to change all 4 every time?

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2012 GM 6MT sports package | FI non res cf exhaust | K&N Drop Ins | Viper 3303 security system w/ tilt sensor | GTR start button | 35% rear 45% side window tint | Michelin PSS