[thstone]

The Nitto Motivo is an all-season high performance tire that is meant to maximize a smooth ride, quietness, and wet handling (at the expense of the other criteria). So, your tire shop is probably correct saying you're experiencing "tread squish" on new tires on dry pavement at the limit. It makes them feel like they are on ice. Very slippery slidey. This condition will probably continue to exist until the tire is about half worn, then they will start to feel like your "old" tires. The alternative is going to a high performance summer tire which will have better dry grip when brand new but may not be as good in the wet (or may be louder or ride harder or cost more money). Tires are all about the tradeoffs.