Scottrade does not show how they calculate the changed basis for a wash sale.
I have determined that the Scottrade 2nd 1099B did show wash sales correctly. They break up the share quantity shown for purchase into different quantities for each purchase/sale on different dates. I had to manually associate the sales reporting for "tax lots" as they call them. All Scottrade adjustments were correct.
One confusing factor is they report "adjustments" in a separate column (but they have already made the adjustment to basis) I had been manually entering the adjustments in my taxact program. I now see that adjustment entry is not required if the reported basis after the Scottrade adjustment to basis is correct on the 1099B, which it was. I discovered this by reading the instructions for form 8949, which says if the reported basis on the 1099B is correct you do not enter code for wash sale or any adjustment amount.
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