Schedule ship date determination

We want order with a Reuest Dates in red to have a scheduled Ship Date of Weds. (8^th). Thus the schedule ship date should be particular week's WED only but for the request dates spanning from Friday of the prior week to Thursday of that particular week.

MON        TUE       WED        THU       FRI 30           31           01           02         03 06           07           08           09         10

Any suggestions?