Yep, seems to me that getting more of the sliders worn is a sign that you're basically reaching to get your knee down, rather than having it come naturally. Mine are worn pretty much like yours, oldsvrider. Though they have extra bits of wear from the time I got my entire body down at Knockhill
Personally, I've always enjoyed passing people who's spending more effort hanging off the bike and sticking their knees out for miles, than they are actually picking speeds and lines for the corners... I've got a photo somewhere on film of two guys at knockhill with practically their entire bodies off the bikes, and the bikes hardly leaning (in the chicane) while I just nip up the inside with both cheeks on teh seat like a policeman