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Subaru AWD in automatic transmission is a multi-plate wet clutch - there is still some friction even when clutch is disengaged. This might explain why rear wheels still turning even in the FWD mode.
There should be little torque though passing to rear wheels.
I do not remember exactly, but there some issues if you leave it in FWD mode permanently - something related to fluid circulation and lubrication.
3.90 vs 4.11 is approx 5% speed difference - way to much for transfer clutch to handle. One crazy idea is to try to get a different diameter wheels (5% more on the back) to compensate for the different ratios. Wouldn't do it on my car though.
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