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This car doesn't need much negative in back. Typically standing up a tire helps with longitudinal grip which is exactly what you need on Accel. More lateral grip won't help you if you are overwhelming the tire as soon as you get near the throttle
The fact that it also helps steady state balance to stand it up a little is a win win. Only downside is more snappy behavior in quick transitions
As a side note, this trade off is one of the reasons a staggered setup is more flexible in terms of chassis tuning. If you have a taller tire in back you can trade some forward bite for lateral grip by adding some rear camber and still have the same forward traction you would with the smaller rear tire. But that's expensive, time consuming to get right, and annoying logistically so I get why most don't bother
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