Because you are using these as track tires with the VDC turned off I wouldn't worry about it too much. The size differential is really only a problem for the traction control, with it disabled it doesn't intervene until the speed difference between front and rear is huge.
For daily driver tires you want the size differential as close as possible, within 2% front to rear.
With the R888 sizes listed your differential front to rear will be 2.3%.
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