Yes, as mentioned, I have entered all data as required, similar to what you show, starting with the 1099K and the individual items with all data.
I haven't knowingly touched the 1099-B. The only reason why I mentioned it is because in the turbotax worksheets, it contains that section "Form 1099-K reconciliation" which is causing the "smart" check message.
Really! That check may work for all-gain, all-loss, and is probably also correct for (2a) - incorrectly reported amount on Form 1099-K (then it makes sense to deduct the line, because gross proceeds need to be corrected), but for mixed gain/loss sales it is simply wrong - you'd still need to reconcile to the TOTAL.
In any case, I have double-checked, and changing proceeds or adjustments on individual sales items does change the tax due, so all the tax calculations seem to be running through fine despite that erroneous message. Good enough. this can be closed.
Thanks
