If the grip increased as you said, the understeer you report would not be unusual. Consider: If on your old tires you were losing grip front and rear, then applying throttle could swing the rear around a bit as your report. Now since the grip threshold is higher, when you notice the understeer, the rears still have some grip and it is harder to kick the back around. It may not be the case that the ratio of front to rear grip has changed, rather you are noticing the understeer while the rears still have some grip.
With these new tires you may have to change your entry a bit. You could enter a little slower and the increased grip would allow you to throttle up earlier on corner exit. Or you could come in hotter and try and recreate the situation where your rears are loose enough to kick it around a bit.
In any event what's important are your lap times -- understeer or not how do your lap times compare to those with the stock tires?
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2010 Platinum Graphite 370z Roadster:Touring/Sport
2013 Subaru BRZ Limited
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