...... The myth about new tires being slick and that people low side in turns because of it is actually caused by using too much pressure in the turn with the rounder profile of a new tire..
Sorry, it is not a "myth" , new tires are slick and do take some time to become tackier. This is why you should not toss your bike hard into turns on new rubber. The rear end sliding out is do to loss of traction, not bad steering input.
New tires always feel diffrent than the worn ones they replaced.
Granted, some tire designs do make the bike "fall into a turn quicker" (or slower) and this is mostly due to profile, but carcass stiffness, tread pattern, the compound used and tire pressure also.
The original poster did not metion what tire pressure he was running, and it should be noted that 880's do require more pressure than the stock tire.
But all things equal, (and they are not) new tires will feel diffrent and act diffrent than worn tires. If you got the bike new with new stock tires, you would have slowly gotten used to the change in feel as the tire wore. By the time the tires needed replacing, you would have already altered your riding habit to work with them not even realizing it. You only really notice the difference when you put on new rubber. (Even if it is the same model tire)
If new tires lost their "roundness" in just a couple hundred miles, they would wear completely out in a few thousand, not 6-10,000 miles.